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    * Mir *

    میـر


    Qajar_Zellolsoltan_Masood_Mirza.jpg
    (Wikipedia) - Mir This article is about the Soviet/Russian space station. For other uses, see Mir (disambiguation). Mir Station statistics COSPAR ID Call sign Crew Launch Launch pad Reentry Mass Length Width Height Pressurised volume Atmospheric pressure Perigee Apogee Orbital inclination Average speed Orbital period Orbits per day Days in orbit Days occupied Number of orbits Configuration
    Mir on 9 February 1998 as seen from the departing Space Shuttle Endeavour during STS-89
    Mir insignia
    1986-017A
    Mir
    3
    20 February 1986 – 23 April 1996
    LC-200/39, and LC-81/23, Baikonur Cosmodrome LC-39A, Kennedy Space Center
    23 March 2001 05:59 UTC
    129,700 kg (285,940 lbs)
    19 m (62.3 ft) from the core module to Kvant-1
    31 m (101.7 ft) from Priroda to the docking module
    27.5 m (90.2 ft) from Kvant-2 to Spektr
    350 m³
    c.101.3 kPa (29.91 inHg, 1 atm)
    354 km (189 nmi) AMSL
    374 km (216 nmi) AMSL
    51.6 degrees
    7,700 m/s (27,700 km/h, 17,200 mph)
    91.9 minutes
    15.7
    5,519 days
    4,592 days
    86,331
    Statistics as of 23 March 2001 (unless noted otherwise)
    References:
    Station elements as of May 1996.

    Mir (Russian: Мир, IPA: ; lit. Peace or World) was a space station that operated in low Earth orbit from 1986 to 2001, owned by the Soviet Union and later by Russia. Mir was the first modular space station and was assembled in orbit from 1986 to 1996. It had a greater mass than that of any previous spacecraft. Until 21 March 2001 it was the largest satellite in orbit, succeeded by the International Space Station after its orbit decayed. The station served as a microgravity research laboratory in which crews conducted experiments in biology, human biology, physics, astronomy, meteorology and spacecraft systems with a goal of developing technologies required for permanent occupation of space.

    Mir was the first continuously inhabited long-term research station in orbit and set the record for the longest continuous human presence in space at 3 644 days until 23 October 2010 when it was surpassed by the ISS. It holds the record for the longest single human spaceflight, with Valeri Polyakov spending 437 days and 18 hours on the station between 1994 and 1995. Mir was occupied for a total of twelve and a half years out of its fifteen-year lifespan, having the capacity to support a resident crew of three, or larger crews for short term visits.

    Following the success of the Salyut programme, Mir represented the next stage in the Soviet Union''s space station programme. The first module of the station, known as the core module or base block, was launched in 1986, and followed by six further modules. Proton rockets were used to launch all of its components except for the docking module, which was installed by space shuttle mission STS-74 in 1995. When complete, the station consisted of seven pressurised modules and several unpressurised components. Power was provided by several photovoltaic arrays attached directly to the modules. The station was maintained at an orbit between 296 km (184 mi) and 421 km (262 mi) altitude and traveled at an average speed of 27,700 km/h (17,200 mph), completing 15.7 orbits per day.

    The station was launched as part of the Soviet Union''s manned spaceflight programme effort to maintain a long-term research outpost in space, and, following the collapse of the USSR, was operated by the new Russian Federal Space Agency (RKA). As a result, the vast majority of the station''s crew were Russian; however, through international collaborations such as the Intercosmos, Euromir and Shuttle-Mir programmes, the station was made accessible to astronauts from North America, several European nations and Japan. The cost of the Mir programme was estimated by former RKA General Director Yuri Koptev in 2001 as $4.2 billion over its lifetime (including development, assembly and orbital operation).

    Contents

    Origins

    Mir was authorised in a decree made on 17 February 1976 to design an improved model of the Salyut DOS-17K space stations. Four Salyut space stations had already been launched since 1971, with three more being launched during Mir''s development. It was planned that the station''s core module (DOS-7 and the backup DOS-8) would be equipped with a total of four docking ports; two at either end of the station as with the Salyut stations, and an additional two ports on either side of a docking sphere at the front of the station to enable further modules to expand the station''s capabilities. By August 1978, this had evolved to the final configuration of one aft port and five ports in a spherical compartment at the forward end of the station.

    It was originally planned that the ports would connect to 7.5 tonne modules derived from the Soyuz spacecraft. These modules would have used a Soyuz propulsion module, as in Soyuz and Progress, and the descent and orbital modules would have been replaced with a long laboratory module. However, following a February 1979 governmental resolution, the programme was consolidated with Vladimir Chelomei''s manned Almaz military space station programme. The docking ports were reinforced to accommodate 20 tonne (22 short tons) space station modules based on the TKS spacecraft. NPO Energia was responsible for the overall space station, with work subcontracted to KB Salyut, due to ongoing work on the Energia rocket and Salyut 7, Soyuz-T, and Progress spacecraft. KB Salyut began work in 1979, and drawings were released in 1982 and 1983. New systems incorporated into the station included the Salyut 5B digital flight control computer and gyrodyne flywheels (taken from Almaz), Kurs automatic rendezvous system, Luch satellite communications system, Elektron oxygen generators, and Vozdukh carbon dioxide scrubbers.

    By early 1984, work on Mir had ground to a halt while all resources were being put into the Buran programme in order to prepare the Buran spacecraft for flight testing. Funding resumed in early 1984 when Valentin Glushko was ordered by the Central Committee''s Secretary for Space and Defence to orbit Mir by early 1986, in time for the 27th Communist Party Congress.

    It was clear that the planned processing flow could not be followed and still meet the 1986 launch date. It was decided on Cosmonaut''s Day (12 April) 1985 to ship the flight model of the base block to the Baikonur cosmodrome and conduct the systems testing and integration there. The module arrived at the launch site on 6 May, with 1100 of 2500 cables requiring rework based on the results of tests to the ground test model at Khrunichev. In October, the base block was rolled outside its cleanroom to carry out communications tests. The first launch attempt on 16 February 1986 was scrubbed when the spacecraft communications failed, but the second launch attempt, on 19 February 1986 at 21:28:23 UTC, was successful, meeting the political deadline.

    Station structure AssemblyA diagram showing the Konus drogue and module movements around Mir''s docking node

    The orbital assembly of Mir began in February 1986 with the launch of the core module on a Proton-K rocket. Four of the six modules which were later added (Kvant-2 in 1989, Kristall in 1990, Spektr in 1995 and Priroda in 1996) followed the same sequence to add themselves to the main Mir complex. Firstly, the module would be launched independently on its own Proton-K and chase the station automatically. It would then dock to the forward docking port on the core module''s docking node, then extend its Lyappa arm to mate with a fixture on the mode''s exterior. The arm would then lift the module away from the forward docking port and rotate it on to the radial port that the module was to mate with, before lowering it down to dock. The node was equipped with only two Konus drogues, however, which were required for dockings. This meant that, prior to the arrival of each new module, the node would have to be depressurised to allow spacewalking cosmonauts to manually relocate the drogue to the next port to be occupied.

    The other two expansion modules, Kvant-1 in 1987 and the docking module in 1995, followed different procedures. Kvant-1, having, unlike the four modules mentioned above, no engines of its own, was launched attached to a tug based on the TKS spacecraft which delivered the module to the aft end of the core module instead of the docking node. Once hard docking had been achieved, the tug undocked and deorbited itself. The docking module, meanwhile, was launched aboard Space Shuttle Atlantis during STS-74 and mated to the orbiter''s Orbiter Docking System. Atlantis then docked, via the module, to Kristall, then left the module behind when it undocked later in the mission. Various other external components, including three truss structures, several experiments and other unpressurised elements were also mounted to the exterior of the station by cosmonauts conducting a total of eighty spacewalks over the course of the station''s history.

    The station''s assembly marked the beginning of the third generation of space station design, being the first to consist of more than one primary spacecraft (thus opening a new era in space architecture). First generation stations such as Salyut 1 and Skylab had monolithic designs, consisting of one module with no resupply capability, whilst the second generation stations Salyut 6 and Salyut 7 comprised a monolithic station with two ports to allow consumables to be replenished by cargo spacecraft such as Progress. The capability of Mir to be expanded with add-on modules meant that each could be designed with a specific purpose in mind (for instance, the core module functioned largely as living quarters), thus eliminating the need to install all the station''s equipment in one module.

    Pressurised modules

    In its completed configuration, the space station consisted of seven different modules, each launched into orbit separately over a period of ten years by either Proton-K rockets or Space Shuttle Atlantis.

    Module Expedition Launch date Launch system Nation Isolated View Station View
    Mir Core Module (Core Module) N/A 19 February 1986 Proton-K Soviet Union
    The base block for the entire Mir complex, the core module, or DOS-7, provided the main living quarters for resident crews and contained environmental systems, early attitude control systems and the station''s main engines. The module was based on hardware developed as part of the Salyut programme, and consisted of a stepped-cylinder main compartment and a spherical ''node'' module, which served as an airlock and provided ports to which four of the station''s expansion modules were berthed and to which a Soyuz or Progress spacecraft could dock. The module''s aft port served as the berthing location for Kvant-1.
    Kvant-1 (Astrophysics Module) EO-2 31 March 1987 Proton-K Soviet Union
    The first expansion module to be launched, Kvant-1 consisted of two pressurised working compartments and one unpressurised experiment compartment. Scientific equipment included an X-ray telescope, an ultraviolet telescope, a wide-angle camera, high-energy X-ray experiments, an X-ray/gamma ray detector, and the Svetlana electrophoresis unit. The module also carried six gyrodynes for attitude control, in addition to life support systems including an Elektron oxygen generator and a Vozdukh carbon dioxide scrubber.
    Kvant-2 (Augmentation Module) EO-5 26 November 1989 Proton-K Soviet Union
    The first TKS based module, Kvant-2, was divided into three compartments; an EVA airlock, an instrument/cargo compartment (which could function as a backup airlock), and an instrument/experiment compartment. The module also carried a Soviet version of the Manned Maneuvering Unit for the Orlan space suit, referred to as Ikar, a system for regenerating water from urine, a shower, the Rodnik water storage system and six gyrodynes to augment those already located in Kvant-1. Scientific equipment included a high-resolution camera, spectrometers, X-ray sensors, the Volna 2 fluid flow experiment, and the Inkubator-2 unit, which was used for hatching and raising quail.
    Kristall (Technology Module) EO-6 31 May 1990 Proton-K Soviet Union
    Kristall, the fourth module, consisted of two main sections. The first was largely used for materials processing (via various processing furnaces), astronomical observations, and a biotechnology experiment utilising the Aniur electrophoresis unit. The second section was a docking compartment which featured two APAS-89 docking ports initially intended for use with the Buran programme and eventually used during the Shuttle-Mir programme. The docking compartment also contained the Priroda 5 camera used for Earth resources experiments. Kristall also carried six gyrodines for attitude control to augment those already on the station, and two collapsible solar arrays.
    Spektr (Power Module) EO-18 20 May 1995 Proton-K Russia
    Spektr was the first of the three modules launched during the Shuttle-Mir programme; it served as the living quarters for American astronauts and housed NASA-sponsored experiments. The module was designed for remote observation of Earth''s environment and contained atmospheric and surface research equipment. Additionally, it featured four solar arrays which generated approximately half of the station''s electrical power. The module also featured a science airlock to expose experiments to the vacuum of space selectively. Spektr was rendered unusable following the collision with Progress M-34 in 1997 which damaged the module, exposing it directly to the vacuum of space.
    Docking Module EO-20 15 November 1995 Space Shuttle Atlantis (STS-74) US
    The docking module was designed to help simplify Space Shuttle dockings to Mir. Before the first shuttle docking mission (STS-71), the Kristall module had to be tediously moved to ensure sufficient clearance between Atlantis and Mir''s solar arrays. With the addition of the docking module, enough clearance was provided without the need to relocate Kristall. It had two identical APAS-89 docking ports, one attached to the distal port of Kristall with the other available for shuttle docking.
    Priroda (Earth Sensing Module) EO-21 26 April 1996 Proton-K Russia
    The seventh and final Mir module, Priroda''s primary purpose was to conduct Earth resource experiments through remote sensing and to develop and verify remote sensing methods. The module''s experiments were provided by twelve different nations, and covered microwave, visible, near infrared, and infrared spectral regions using both passive and active sounding methods. The module possessed both pressurised and unpressurised segments, and featured a large, externally mounted synthetic aperture radar dish.
    Unpressurised elementsThe Travers radar antenna, Sofora girder, VDU thruster block, SPK unit and a Strela crane, alongside Kvant-2 and Priroda

    In addition to the pressurised modules, Mir featured a large number of external components. The largest component was the Sofora girder, a large scaffolding-like structure consisting of 20 segments which, when assembled, projected 14 metres from its mount on Kvant-1. A self-contained thruster block, referred to as the VDU, was mounted on the end of Sofora and was used to augment the roll-control thrusters on the core module. The VDU''s increased distance from Mir''s axis lead to an 85% decrease in fuel consumption, reducing the amount of propellant required to orient the station. A second girder, Rapana, was mounted aft of Sofora on Kvant-1. This girder, a scaled-down prototype of a structure intended to be used on Mir-2 to hold large parabolic dishes away from the main station structure, was 5 metres long and used as a mounting point for externally mounted exposure experiments.

    To assist in moving objects around the exterior of the station during EVAs, Mir featured two Strela cargo cranes mounted to the port and starboard sides of the core module and used for moving spacewalking cosmonauts and parts around the exterior of the station. The cranes consisted of telescopic poles assembled in sections which measured around 1.8 metres (6 ft) when collapsed, but when extended using a hand crank were 14 metres (46 ft) long, meaning that all of the station''s modules could easily be accessed during spacewalks.

    Each module was also fitted with a number of external components specific to the experiments that were carried out within that module, the most obvious being the Travers antenna mounted to Priroda. This synthetic aperture radar consisted of a large dish-like framework mounted to the exterior of the module, with associated equipment within, used for Earth observations experiments, as was most of the other equipment on Priroda, including various radiometers and scan platforms. Kvant-2 also featured a number of scan platforms and was also fitted with a mounting bracket to which the cosmonaut manoeuvring unit, or Ikar, was mated. This backpack was designed to assist cosmonauts in moving around the station and the planned Buran in a manner similar to the U.S. Manned Maneuvering Unit, but it was only used once, during EO-5.

    In addition to module-specific equipment, Kvant-2, Kristall, Spektr and Priroda were each equipped with one Lyappa arm, a robotic arm which, after the module had docked to the core module''s forward port, grappled one of two fixtures positioned on the core module''s docking node. The arriving module''s docking probe was then retracted, and the arm raised the module so that it could be pivoted 90° for docking to one of the four radial docking ports.

    Power supplyA view of the four solar arrays on Spektr

    Photovoltaic (PV) arrays powered Mir. The station used a 28 volt DC supply which provided 5-, 10-, 20- and 50-amp taps. When the station was illuminated by sunlight, several solar arrays mounted on the pressurised modules provided power to Mir''s systems and charged the nickel-cadmium storage batteries installed throughout the station. The arrays rotated in only one degree of freedom over a 180° arc, and tracked the sun using sun sensors and motors installed in the array mounts. The station itself also had to be oriented to ensure optimum illumination of the arrays. When the station''s all-sky sensor detected that Mir had entered Earth''s shadow, the arrays were rotated to the optimum angle predicted for reacquiring the sun once the station passed out of the shadow. The batteries, which each had a capacity of 60 Ah, were then used to power the station until the arrays recovered their maximum output on the day side of Earth.

    The solar arrays themselves were launched and installed over a period of eleven years, more slowly than originally planned, with the station continually suffering from a shortage of power as a result. The first two arrays, each 38 m2 (409 ft2) in area, were launched on the core module, and together provided a total of 9 kW of power. A third, dorsal panel was launched on Kvant-1 and mounted on the core module in 1987, providing a further 2 kW over an area of 22 m2 (237 ft2). Kvant-2, launched in 1989, provided two 10 m (32.8 ft) long panels which supplied 3.5 kW each, whilst Kristall was launched with two collapsible, 15 m (49.2 ft) long arrays (providing 4 kW each) which were intended to be moved to Kvant-1 and installed on mounts which were attached during a spacewalk by the EO-8 crew in 1991.

    This relocation was not begun, however, until 1995, when the panels were retracted and the left panel installed on Kvant-1. By this time all the arrays had degraded and were supplying much less power than they originally had. To rectify this, Spektr (launched in 1995), which had initially been designed to carry two arrays, was modified to hold four, providing a total of 126 m2 (1360 ft2) of array with a 16 kW supply. Two further arrays were flown to the station on board the Space Shuttle Atlantis during STS-74, carried on the docking module. The first of these, the Mir cooperative solar array, consisted of American photovoltaic cells mounted on a Russian frame. It was installed on the unoccupied mount on Kvant-1 in May 1996 and was connected to the socket that had previously been occupied by the core module''s dorsal panel, which was by this point barely supplying 1 kW. The other panel, originally intended to be launched on Priroda, replaced the Kristall panel on Kvant-1 in November 1997, completing the station''s electrical system.

    Total power supply by solar arrays, had the older ones not been degraded, would have been 42 kW by 1997.

    Orbit controlGraph showing the changing altitude of Mir from 19 February 1986 until 21 March 2001

    Mir was maintained in a near circular orbit with an average perigee of 354 km (220 mi) and an average apogee of 374 km (232 mi), travelling at an average speed of 27,700 km/h (17,200 mph) and completing 15.7 orbits per day. As the station constantly lost altitude because of a slight atmospheric drag, it needed to be boosted to a higher altitude several times each year. This boost was generally performed by Progress resupply vessels, although during the Shuttle-Mir programme the task was performed by U.S. Space Shuttles, and, prior to the arrival of Kvant-1, the engines on the core module could also accomplish the task.

    The attitude (orientation) of the station was independently determined by a set of externally mounted sun, star and horizon sensors. Attitude information was conveyed between updates by rate sensors. Attitude control was maintained by a combination of two mechanisms; in order to hold a set attitude, a system of twelve control moment gyroscopes (CMGs, or "gyrodynes") rotating at 10,000 rpm kept the station oriented, six CMGs being located in each of the Kvant-1 and Kvant-2 modules. When the attitude of the station needed to be changed, the gyrodynes were disengaged, thrusters (including those mounted directly to the modules, and the VDU thruster used for roll control mounted to the Sofora girder) were used to attain the new attitude and the CMGs were reengaged. This was done fairly regularly depending on experimental needs; for instance, Earth or astronomical observations required that the instrument recording images be continuously aimed at the target, and so the station was oriented to make this possible. Conversely, materials processing experiments required the minimisation of movement on board the station, and so Mir would be oriented in a gravity gradient attitude for stability. Prior to the arrival of the modules containing these gyrodynes, the station''s attitude was controlled using thrusters located on the core module alone, and, in an emergency, the thrusters on docked Soyuz spacecraft could be used to maintain the station''s orientation.

    Communications

    Radio communications provided telemetry and scientific data links between Mir and the RKA Mission Control Centre (TsUP). Radio links were also used during rendezvous and docking procedures and for audio and video communication between crew members, flight controllers and family members. As a result, Mir was equipped with a number of communication systems used for different purposes. The station communicated directly with the ground via the Lira antenna mounted to the core module. The Lira antenna also had the capability to use the Luch data relay satellite system (which fell into disrepair in the 1990s) and the network of Soviet tracking ships deployed in various locations around the world (which also became unavailable in the 1990s). UHF radio was used by cosmonauts conducting EVAs. UHF was also employed by other spacecraft that docked to or undocked from the station, such as Soyuz, Progress, and the Space Shuttle, in order to receive commands from the TsUP and Mir crew members via the TORU system.

    MicrogravityMir in orbit high above the Earth

    At Mir''s orbital altitude, the force of Earth''s gravity was 88% of that at sea level. While the constant free fall of the station offered a perceived sensation of weightlessness, the onboard environment was not one of weightlessness or zero gravity. The environment was, however, often described as microgravity. This state of perceived weightlessness was not perfect, however, being disturbed by five separate effects:

    Life support

    Mir''s Environmental Control and Life Support System (ECLSS) provided or controlled atmospheric pressure, fire detection, oxygen levels, waste management and water supply. The highest priority for the ECLSS was the station''s atmosphere, but the system also collected, processed, and stored waste and water produced and used by the crew—a process that recycles fluid from the sink, toilet, and condensation from the air. The Elektron system generated oxygen on board the station. The crew had a backup option in the form of bottled oxygen and Solid Fuel Oxygen Generation (SFOG) canisters, a system known as Vika. Carbon dioxide was removed from the air by the Vozdukh system. Other by-products of human metabolism, such as methane from the intestines and ammonia from sweat, were removed by activated charcoal filters. These systems are all now operational on the International Space Station.

    The atmosphere on board Mir was similar to Earth''s. Normal air pressure on the station was 101.3 kPa (14.7 psi); the same as at sea level on Earth. An Earth-like atmosphere offers benefits for crew comfort, and is much safer than the alternative, a pure oxygen atmosphere, because of the increased risk of a fire such as that responsible for the deaths of the Apollo 1 crew.

    See also: ISS ECLSS International cooperationReinhold Ewald (right) and Vasily Tsibliyev in the core module during the German''s visit to MirIntercosmos Main article: Intercosmos

    Intercosmos ("ИнтерКосмос" Interkosmos) was a space exploration programme run by the Soviet Union to allow members from the military forces of allied Warsaw Pact countries to participate in manned and unmanned space exploration missions. Participation was also made available to governments of sympathetic countries, such as France and India.

    Only the last three of the programme''s fourteen missions consisted of an expedition to Mir but none resulted in an extended stay in the station.

    European involvement

    Over the course of the Mir programme, various European astronauts visited the station as part of several cooperative programmes:

    Shuttle–Mir programme Main article: Shuttle–Mir ProgramThe seven NASA astronauts who carried out long-duration missions on Mir

    In the early 1980s, NASA planned to launch a modular space station called Freedom as a counterpart to Mir, while the Soviets were planning to construct Mir-2 in the 1990s as a replacement for the station. Because of budget and design constraints, Freedom never progressed past mock-ups and minor component tests and, with the fall of the Soviet Union and the end of the Space Race, the project was nearly cancelled entirely by the United States House of Representatives. The post-Soviet economic chaos in Russia also led to the cancellation of Mir-2, though only after its base block, DOS-8, had been constructed. Similar budgetary difficulties were faced by other nations with space station projects, which prompted the American government to negotiate with European states, Russia, Japan, and Canada in the early 1990s to begin a collaborative project. In June 1992, American president George H. W. Bush and Russian president Boris Yeltsin agreed to cooperate on space exploration. The resulting Agreement between the United States of America and the Russian Federation Concerning Cooperation in the Exploration and Use of Outer Space for Peaceful Purposes called for a short joint space programme with one American astronaut deployed to the Russian space station Mir and two Russian cosmonauts deployed to a Space Shuttle.

    In September 1993, U.S. Vice President Al Gore, Jr., and Russian Prime Minister Viktor Chernomyrdin announced plans for a new space station, which eventually became the International Space Station. They also agreed, in preparation of this new project, that the United States would be heavily involved in the Mir programme as part of an international project known as the Shuttle–Mir programme. The project, sometimes called "Phase One", was intended to allow the United States to learn from Russian experience in long-duration spaceflight and to foster a spirit of cooperation between the two nations and their space agencies, the U.S. National Aeronautics and Space Administration (NASA) and the Russian Federal Space Agency (Roskosmos). The project helped to prepare the way for further cooperative space ventures, specifically, "Phase Two" of the joint project, the construction of the International Space Station (ISS). The programme was announced in 1993; the first mission started in 1994, and the project continued until its scheduled completion in 1998. Eleven Space Shuttle missions, a joint Soyuz flight, and almost 1000 cumulative days in space for U.S. astronauts occurred over the course of seven long-duration expeditions.

    Other visitors Life on boardPlay mediaA video tour of Mir from September 1996, during STS-79A view of the interior of the core module''s docking node, demonstrating the crowded nature of the station.

    Inside, the 130 tonne Mir resembled a cramped labyrinth, crowded with hoses, cables and scientific instruments — as well as articles of everyday life, such as photos, children''s drawings, books and a guitar. It commonly housed three crew members, but was capable of supporting as many as six for up to a month. The station was designed to remain in orbit for around five years, but ended up remaining in orbit for fifteen. As a result, NASA astronaut John Blaha reported that, with the exception of Priroda and Spektr, which were added later into the station''s life, Mir did look used, which is to be expected given it had been lived in for ten to eleven years without being brought home and cleaned.

    Crew schedule

    The time zone used on board Mir was Moscow Time (UTC+03). The windows were covered during night hours to give the impression of darkness because the station experienced 16 sunrises and sunsets a day. A typical day for the crew began with a wake-up at 08:00, followed by two hours of personal hygiene and breakfast. Work was conducted from 10:00 until 13:00, followed by an hour of exercise and an hour''s lunch break. Three more hours of work and another hour of exercise followed lunch, and the crews began preparing for their evening meal at about 19:00. The cosmonauts were free to do as they wished in the evening, and largely worked to their own pace during the day.

    In their spare time, crews were able to catch up with work, observe the Earth below, respond to letters, drawings and other items sent up from Earth (and give them an official stamp to show they had been aboard Mir), or make use of the station''s ham radio. Two amateur radio call signs, U1MIR and U2MIR, were assigned to Mir in the late 1980s, allowing amateur radio operators on Earth to communicate with the cosmonauts. The station was also equipped with a large supply of books and films for the crew to read and watch.

    NASA astronaut Jerry Linenger related how life on board Mir was structured and lived according to the detailed itineraries provided by ground control. Every second on board was accounted for and all activities were timetabled. After working some time on Mir, Linenger came to feel that the order in which his activities were allocated did not represent the most logical or efficient order possible for these activities. He decided to perform his tasks in an order that he felt enabled him to work more efficiently, be less fatigued, and suffer less from stress. Linenger noted that his comrades on Mir did not "improvise" in this way, and as a medical doctor he observed the effects of stress on his comrades that he believed was the outcome of following an itinerary without making modifications to it. Despite this, however, he commented that his comrades performed all their tasks in a supremely professional manner.

    Astronaut Shannon Lucid, who set the record for longest stay in space by a woman while aboard Mir (surpassed by Sunita Williams 11 years later on the ISS), also commented about working aboard Mir saying "I think going to work on a daily basis on Mir is very similar to going to work on a daily basis on an outstation in Antarctica. The big difference with going to work here is the isolation, because you really are isolated. You don''t have a lot of support from the ground. You really are on your own."

    ExerciseShannon Lucid exercises on a treadmill during her stay aboard Mir.

    The most significant adverse effects of long-term weightlessness are muscle atrophy and deterioration of the skeleton, or spaceflight osteopenia. Other significant effects include fluid redistribution, a slowing of the cardiovascular system, decreased production of red blood cells, balance disorders, and a weakening of the immune system. Lesser symptoms include loss of body mass, nasal congestion, sleep disturbance, excess flatulence, and puffiness of the face. These effects begin to reverse quickly upon return to the Earth.

    To prevent some of these adverse physiological effects, the station was equipped with two treadmills (in the core module and Kvant-2) and a stationary bicycle (in the core module); each cosmonaut was to cycle the equivalent of 10 km and run the equivalent of 5 km per day. Cosmonauts used bungee cords to strap themselves to the treadmill. Researchers believe that exercise is a good countermeasure for the bone and muscle density loss that occurs when humans live for a long time without gravity.

    Hygiene

    There were two space toilets (ASUs) on Mir, located in the core module and Kvant-2. These units used a fan-driven suction system similar to the Space Shuttle Waste Collection System. Cosmonauts first fastened themselves to the toilet seat, which was equipped with spring-loaded restraining bars to ensure a good seal. A lever operated a powerful fan and a suction hole slid open: the air stream carried the waste away. Solid waste was collected in individual bags which were stored in an aluminium container. Full containers were transferred to Progress spacecraft for disposal. Liquid waste was evacuated by a hose connected to the front of the toilet, with anatomically appropriate "urine funnel adapters" attached to the tube so both men and women could use the same toilet. Waste was collected and transferred to the Water Recovery System, where it was recycled back into drinking water, although this was usually used to produce oxygen via the Elektron system.

    Mir featured a shower, referred to as Bania, which was located in Kvant-2. The unit was a major improvement on the units installed in previous Salyut stations, but proved difficult to use due to the amount of time required to set up, use, and pack it away. The shower, which featured a plastic curtain and fan to collect water via an airflow, was later converted into a steam room, eventually having its plumbing removed and the space was reused. When the shower was unavailable, crew members washed using wet wipes, with soap dispensed from a toothpaste tube-like container, or using a washbasin equipped with a plastic hood, located in the core module. Crews were also provided with rinse-less shampoo and edible toothpaste to save water.

    On a 1998 visit to Mir, bacteria and larger organisms were found to have proliferated in water globules formed from moisture that had condensed behind service panels.

    Sleeping in spaceCosmonaut Yury Usachov in his Kayutka

    The station provided two permanent crew quarters, called "Kayutkas". These were phonebox-sized booths set towards the rear of the core module, each featuring a tethered sleeping bag, a fold-out desk and a porthole, in addition to storage for a cosmonaut''s personal effects. Visiting crews had no allocated sleep module, instead attaching a sleeping bag to an available space on a wall; American astronauts installed themselves within Spektr until a collision with a Progress spacecraft caused the depressurization of that module. It was important that crew accommodations be well ventilated; otherwise, astronauts could wake up oxygen-deprived and gasping for air, because a bubble of their own exhaled carbon dioxide had formed around their heads.

    Food and drink See also: Space food

    Most of the food eaten by station crews was frozen, refrigerated or canned. Menus were prepared by the cosmonauts, with the help of a dietitian, before their flight to the station. The diet was designed to provide around 100 g of protein, 130 g of fat and 330 g of carbohydrates per day, in addition to appropriate mineral and vitamin supplements. Meals were spread out throughout the day to aid assimilation. Canned food such as jellied beef tongue was placed into one of several niches in the core module''s table, where they could be warmed in 5–10 minutes. Usually, crews drank tea, coffee and fruit juices, but, unlike the ISS, the station also had a supply of cognac and vodka for special occasions.

    Microbiological environmental hazards

    In the 1990s samples of extremophile molds were taken from Mir. Molds that develop aboard space stations can produce acids that degrade metal, glass and rubber.

    Station operations Expeditions Main article: List of Mir Expeditions See also: List of Mir spacewalks

    During its 15-year spaceflight, Mir was visited by a total of 28 long-duration or "principal" crews, each of which was given a sequential expedition number formatted as EO-X. Expeditions varied in length (from the 72-day flight of the crew of EO-28 to the 437-day flight of Valeri Polyakov), but generally lasted around six months. Principal expedition crews consisted of two to three crew members, who often launched as part of one expedition but returned with another (Polyakov launched with EO-14 and landed with EO-17). The principal expeditions were often supplemented with visiting crews who remained on the station during the week-long handover period between one crew and the next before returning with the departing crew, the station''s life support system being able to support a crew of up to six for short periods. The station was occupied for a total of four distinct periods; 12 March–16 July 1986 (EO-1), 5 February 1987 – 27 April 1989 (EO-2–EO-4), the record-breaking run from 5 September 1989 – 28 August 1999 (EO-5–EO-27), and 4 April–16 June 2000 (EO-28). By the time of the station''s deorbit, it had been visited by 104 different people from twelve different nations, making it the most visited spacecraft in history (a record later surpassed by the International Space Station).

    Early existence See also: Mir Core Module and Kvant-1The core module with Kvant-1 and Soyuz TM-3

    Due to the pressure to launch the station in such short order, mission planners were left without Soyuz spacecraft or modules to launch to the station at first. It was decided to launch Soyuz T-15 on a dual mission to both Mir and Salyut 7.

    Leonid Kizim and Vladimir Solovyov first docked with the Mir space station on 15 March 1986. During their nearly 51-day stay on Mir, they brought the station online and checked its systems. They also unloaded two Progress spacecraft launched after their arrival, Progress 25 and Progress 26.

    On 5 May 1986, they undocked from Mir for a day-long journey to Salyut 7. They spent 51 days there and gathered 400 kg of scientific material from Salyut 7 for return to Mir. While Soyuz T-15 was at Salyut 7, the unmanned Soyuz TM-1 arrived at the unoccupied Mir and remained for 9 days, testing the new Soyuz TM model. Soyuz T-15 redocked with Mir on 26 June and delivered the experiments and 20 instruments, including a multichannel spectrometer. The EO-1 crew spent their last 20 days on Mir conducting Earth observations before returning to Earth on 16 July 1986, leaving the new station unoccupied.

    The second expedition to Mir, EO-2, launched on Soyuz TM-2 on 5 February 1987. During their stay, the Kvant-1 module, launched on 30 March 1987, arrived. It was the first experimental version of a planned series of ''37K'' modules scheduled to be launched to Mir on the Soviet Buran spacecraft. Kvant-1 was originally planned to dock with Salyut 7; however, due to technical problems during its development, it was reassigned to Mir. The module carried the first set of six gyroscopes for attitude control. The module also carried instruments for X-ray and ultraviolet astrophysical observations.

    The initial rendezvous of the Kvant-1 module with Mir on 5 April 1987 was troubled by the failure of the onboard control system. After the failure of the second attempt to dock, the resident cosmonauts, Yuri Romanenko and Aleksandr Laveykin, conducted an EVA to fix the problem. They found a trash bag which had been left in orbit after the departure of one of the previous cargo ships and was now located between the module and the station, which prevented the docking. After removing the bag docking could be completed on 12 April.

    The Soyuz TM-2 launch was the beginning of a string of 6 Soyuz launches and three long-duration crews between 5 February 1987 and 27 April 1989. This period also saw the first international visitors to the station, Muhammed Faris (Syria), Abdul Ahad Mohmand (Afghanistan) and Jean-Loup Chrétien (France). With the departure of EO-4 on Soyuz TM-7 on 27 April 1989 the station was once again left unoccupied.

    Third start See also: Kvant-2 and Kristall

    The launch of Soyuz TM-8 on 5 September 1989 marked the beginning of the longest human presence in space up until 23 October 2010 (when this record was surpassed by the ISS). It also marked the beginning of Mir''s second expansion. The Kvant-2 and Kristall modules were now ready for launch. Alexander Viktorenko and Aleksandr Serebrov docked with Mir and brought the station out of its five-month hibernation. On 29 September the cosmonauts installed equipment in the docking system in preparation for the arrival of Kvant-2, the first of the 20 tonne add-on modules based on the TKS spacecraft from the Almaz programme.

    Mir following the arrival of Kvant-2 in 1989

    After a delay of 40 days due to problems with a batch of computer chips, Kvant-2 was launched on 26 November 1989. After problems deploying the craft''s solar array and with the automated docking systems on both Kvant-2 and Mir, the new module was docked manually on 6 December. Kvant-2 added a second set of gyrodines to Mir, and also carried the new life support systems for recycling water and generating oxygen on board the station, reducing its dependence on resupply from the ground. The module also featured a large airlock with a one-metre hatch. A special backpack unit (known as Ikar), an equivalent of the U.S. MMU, was located inside Kvant-2''s airlock.

    Soyuz TM-9 launched EO-6 crew members Anatoly Solovyev and Aleksandr Balandin on 11 February 1990. While docking, the EO-5 crew on board Mir noted that three thermal blankets on the ferry were loose, potentially creating problems on reentry, but it was decided that they would be manageable. Their stay on board Mir saw the addition of the Kristall module, launched on 31 May 1990. The first docking attempt on 6 June was aborted due to an attitude control thruster failure. Kristall arrived at Mir’s front port on 10 June and was relocated to the lateral port opposite Kvant-2 the next day, restoring the equilibrium of the complex. Due to the delay in the docking of Kristall, EO-6 was extended by 10 days to permit the activation of the module’s systems and to accommodate the EVA to repair the loose thermal blankets on Soyuz TM-9.

    Kristall contained furnaces for use in producing crystals under microgravity conditions (hence the choice of name for the module). The module was also equipped with biotechnology research equipment, including a small greenhouse for plant cultivation experiments which was equipped with a source of light and a feeding system, in addition to equipment for astronomical observations. The most obvious features of the module, however, were the two Androgynous Peripheral Attach System (APAS-89) docking ports designed to be compatible with the Buran spacecraft. Although they were never used in a Buran docking, they were later to prove very useful during the Shuttle-Mir programme, providing a berthing location for U.S Space Shuttles.

    The EO-7 relief crew arrived aboard Soyuz TM-10 on 3 August 1990. The new crew arrived at Mir with quail for Kvant-2''s cages, one of which laid an egg en route to the station. It was returned to Earth, along with 130 kg of experiment results and industrial products, in Soyuz TM-9. Two more expeditions, EO-8 and EO-9, continued the work of their predecessors whilst tensions grew back on Earth.

    Post-Soviet periodA view of Mir from Soyuz TM-17 on 3 July 1993 showing ongoing docking operations at the station

    The EO-10 crew, launched aboard Soyuz TM-13 on 2 October 1991, was the last crew to launch from the USSR and continued the occupation of Mir through the fall of the Soviet Union. The crew is notable for having launched as Soviet citizens and returning to earth as Russians. The newly formed Russian Federal Space Agency (Roskosmos) was unable to finance the unlaunched Spektr and Priroda modules, instead putting them into storage and ending Mir''s second expansion.

    The first manned mission flown from an independent Kazakhstan was Soyuz TM-14, launched on 17 March 1992, which carried the EO-11 crew to Mir, docking on 19 March before the departure of Soyuz TM-13. On 17 June, Russian President Boris Yeltsin and U.S. President George H. W. Bush announced what would later become the Shuttle-Mir programme, a cooperative venture which would prove very useful to the cash-strapped Roskosmos (and led to the eventual completion and launch of Spektr and Priroda). EO-12 followed in July, alongside a brief visit by French astronaut Michel Tognini. The crew which succeeded them, EO-13, began preparations for the Shuttle-Mir programme by flying to the station in a modified spacecraft, Soyuz TM-16 (launched on 26 January 1993), which was equipped with an APAS-89 docking system rather than the usual probe-and-drogue, enabling it to dock to Kristall and test the port which would later be used by U.S. space shuttles. The spacecraft also enabled controllers to obtain data on the dynamics of docking a spacecraft to a space station off the station''s longitudinal axis, in addition to data on the structural integrity of this configuration via a test called Rezonans conducted on 28 January. Soyuz TM-15, meanwhile, departed with the EO-12 crew on 1 February.

    Throughout the period following the collapse of the USSR, crews on Mir experienced occasional reminders of the economic chaos occurring in Russia. The initial cancellation of Spektr and Priroda was the first such sign, closely followed by the reduction in communications as a result of the fleet of tracking ships being withdrawn from service by Ukraine. The new Ukrainian government also vastly raised the price of the Kurs docking systems, manufactured in Kiev – the Russians'' attempts to reduce their dependence on Kurs would later lead to accidents during TORU tests in 1997. Various Progress spacecraft had parts of their cargoes missing, either because the consumable in question had been unavailable, or because the ground crews at Baikonur had, in desperation, looted them. The problems became particularly obvious during the launch of the EO-14 crew aboard Soyuz TM-17 in July; half an hour before launch there was a black-out at the pad, and the entire power supply to the nearby city of Leninsk failed an hour after launch. Nevertheless, the spacecraft launched on time and arrived at the station two days later. All of Mir''s ports, however, were occupied, and so Soyuz TM-17 had to station-keep 200 metres away from the station for half an hour before docking whilst Progress M-18 vacated the core module''s front port and departed.

    The EO-13 crew departed on 22 July, and soon after Mir passed through the annual Perseid meteor shower, during which the station was hit by several particles. A spacewalk was conducted on 28 September to inspect the station''s hull, but no serious damage was reported. Soyuz TM-18 arrived on 10 January 1994 carrying the EO-15 crew (including Valeri Polyakov, who was to remain on Mir for 14 months), and Soyuz TM-17 left on 14 January. The undocking was unusual, however, in that the spacecraft was to pass along Kristall in order to obtain photographs of the APAS to assist in the training of space shuttle pilots. Due to an error in setting up the control system, the spacecraft struck the station a glancing blow during the manoeuvre, scratching the exterior of Kristall.

    On 3 February 1994, Mir veteran Sergei Krikalev became the first Russian cosmonaut to launch on a U.S. spacecraft, flying on Space Shuttle Discovery during STS-60.

    The launch of Soyuz TM-19, carrying the EO-16 crew, was delayed due to the unavailability of a payload fairing for the booster that was to carry it, but the spacecraft eventually left Earth on 1 July 1994 and docked two days later. They stayed only four months to allow the Soyuz schedule to line up with the planned space shuttle manifest, and so Polyakov greeted a second resident crew in October, prior to the undocking of Soyuz TM-19, when the EO-17 crew arrived in Soyuz TM-20.

    Shuttle–Mir Main article: Shuttle–Mir Program See also: Spektr, Priroda and Mir Docking ModuleSpace Shuttle Atlantis docked to Mir on STS-71

    The 3 February launch of Space Shuttle Discovery, flying STS-63, opened operations on Mir for 1995. Referred to as the "near-Mir" mission, the mission saw the first rendezvous of a space shuttle with Mir as the orbiter approached within 37 feet (11 m) of the station as a dress rehearsal for later docking missions and for equipment testing. Five weeks after Discovery''s departure, the EO-18 crew, including the first U.S. cosmonaut Norman Thagard, arrived in Soyuz TM-21. The EO-17 crew left a few days later, with Polyakov completing his record-breaking 437-day spaceflight. During EO-18, the Spektr science module (which served as living and working space for American astronauts) was launched aboard a Proton rocket and docked to the station, carrying research equipment from America and other nations. The expedition''s crew returned to Earth aboard Space Shuttle Atlantis following the first Shuttle–Mir docking mission, STS-71. Atlantis, launched on 27 June 1995, successfully docked with Mir on 29 June becoming the first U.S. spacecraft to dock with a Russian spacecraft since the ASTP in 1975. The orbiter delivered the EO-19 crew and returned the EO-18 crew to Earth. The EO-20 crew were launched on 3 September, followed in November by the arrival of the docking module during STS-74.

    The two-man EO-21 crew was launched on 21 February 1996 aboard Soyuz TM-23 and were soon joined by U.S. crew member Shannon Lucid, who was brought to the station by Atlantis during STS-76. This mission saw the first joint U.S. spacewalk on Mir take place deploying the MEEP package on the docking module. Lucid became the first American to carry out a long-duration mission aboard Mir with her 188-day mission, which set the U.S. single spaceflight record. During Lucid''s time aboard Mir, Priroda, the station''s final module, arrived as did French visitor Claudie Haigneré flying the Cassiopée mission. The flight aboard Soyuz TM-24 also delivered the EO-22 crew of Valery Korzun and Aleksandr Kaleri.

    Lucid''s stay aboard Mir ended with the flight of Atlantis on STS-79, which launched on 16 September. This, the fourth docking, saw John Blaha transferring onto Mir to take his place as resident U.S. astronaut. His stay on the station improved operations in several areas, including transfer procedures for a docked space shuttle, "hand-over" procedures for long duration American crew members and "ham" amateur radio communications, and also saw two spacewalks to reconfigure the station''s power grid. In all, Blaha spent four months with the EO-22 crew before returning to Earth aboard Atlantis on STS-81 in January 1997, at which point he was replaced by physician Jerry Linenger. During his flight, Linenger became the first American to conduct a spacewalk from a foreign space station and the first to test the Russian-built Orlan-M spacesuit alongside Russian cosmonaut Vasili Tsibliyev, flying EO-23. All three crew members of EO-23 performed a "fly-around" in Soyuz TM-25 spacecraft. Linenger and his Russian crewmates Vasili Tsibliyev and Aleksandr Lazutkin faced several difficulties during the mission, including the most severe fire aboard an orbiting spacecraft (caused by a malfunctioning Vika), failures of various on board systems, a near collision with Progress M-33 during a long-distance TORU test and a total loss of station electrical power. The power failure also caused a loss of attitude control, which led to an uncontrolled "tumble" through space.

    Damaged solar arrays on Mir''s Spektr module following a collision with Progress-M34 in September 1997

    Linenger was succeeded by Anglo-American astronaut Michael Foale, carried up by Atlantis on STS-84, alongside Russian mission specialist Elena Kondakova. Foale''s increment proceeded fairly normally until 25 June when during the second test of the Progress manual docking system, TORU, Progress M-34 collided with solar arrays on the Spektr module and crashed into the module''s outer shell, puncturing the module and causing depressurisation on the station. Only quick actions on the part of the crew, cutting cables leading to the module and closing Spektr''s hatch, prevented the crews having to abandon the station in Soyuz TM-25. Their efforts stabilised the station''s air pressure, whilst the pressure in Spektr, containing many of Foale''s experiments and personal effects, dropped to a vacuum. In an effort to restore some of the power and systems lost following the isolation of Spektr and to attempt to locate the leak, EO-24 commander Anatoly Solovyev and flight engineer Pavel Vinogradov carried out a risky salvage operation later in the flight, entering the empty module during a so-called "intra-vehicular activity" or "IVA" spacewalk and inspecting the condition of hardware and running cables through a special hatch from Spektr''s systems to the rest of the station. Following these first investigations, Foale and Solovyev conducted a 6-hour EVA on the surface of Spektr to inspect the damage to the punctured module.

    After these incidents, the U.S. Congress and NASA considered whether to abandon the programme out of concern for the astronauts'' safety, but NASA administrator Daniel Goldin decided to continue the programme. The next flight to Mir, STS-86, brought David Wolf to the station aboard Atlantis. During the orbiter''s stay Titov and Parazynski conducted a spacewalk to affix a cap to the docking module for a future attempt by crew members to seal off the leak in Spektr''s hull. Wolf spent 119 days aboard Mir with the EO-24 crew and was replaced during STS-89 with Andy Thomas, who carried out the last U.S. expedition on Mir. The EO-25 crew arrived in Soyuz TM-27 in January 1998 before Thomas returned to Earth on the final Shuttle–Mir mission, STS-91.

    Final days and deorbit Main article: Deorbit of MirMir breaks up in Earth''s atmosphere over the South Pacific on 23 March 2001.

    Following the departure of Discovery on 8 June 1998, the EO-25 crew of Budarin and Musabayev were left aboard the station, carrying out materials experiments and the compiling of a station inventory. Meanwhile, back on Earth, Yuri Koptev, the director of the Roskosmos, announced on 2 July that, due to a lack of funding to keep Mir flying, the station would be deorbited in June 1999. The EO-26 crew of Gennady Padalka and Sergei Avdeyev arrived on 15 August in Soyuz TM-28, alongside physicist Yuri Baturin, who departed with the EO-25 crew on 25 August in Soyuz TM-27. The crew carried out two spacewalks, one inside Spektr to reseat some power cables and another outside to set up experiments delivered by Progress M-40, which also carried a large amount of propellant to begin alterations to Mir''s orbit ready for the station''s decommissioning. 20 November 1998 saw the launch of Zarya, the first module of the International Space Station, but delays to the new station''s service module Zvezda had led to calls for Mir to be kept in orbit past 1999. Roskosmos, however, confirmed that it would not fund Mir past the set deorbit date.

    The crew of EO-27, consisting of Viktor Afanasyev and Jean-Pierre Haigneré arrived in Soyuz TM-29 on 22 February 1999 alongside Ivan Bella, who returned to Earth with Padalka in Soyuz TM-28. The crew carried out three EVAs to retrieve experiments and deploy a prototype communications antenna on Sofora. Meanwhile, on 1 June it was announced that the deorbit of the station would be delayed by six months to allow time to seek alternative funding to keep the station operating. The rest of the expedition was spent preparing the station for its deorbit; a special analogue computer was installed and each of the modules, starting with the docking module, was mothballed in turn and sealed off. The crew loaded their results into Soyuz TM-29 and departed Mir on 28 August 1999, ending a run of continuous occupation of the station which had lasted for eight days short of ten years. The station''s gyrodynes and main computer were shut down on 7 September, leaving Progress M-42 to control Mir and refine the station''s orbital decay rate.

    Near the end of its life, there were plans for private interests to purchase Mir, possibly for use as the first orbital television/movie studio. The privately funded Soyuz TM-30 mission by MirCorp, launched on 4 April 2000, carried two crew members, Sergei Zalyotin and Aleksandr Kaleri, to the station for two months to do repair work with the hope of proving that the station could be made safe. This was, however, to be the last manned mission to Mir - while Russia was optimistic about Mir''s future, its commitments to the International Space Station project left no funding to support the aging station.

    Mir''s deorbit was carried out in three stages. The first stage involved waiting for atmospheric drag to reduce the station''s orbit to an average of 220 kilometres (140 mi). This began with the docking of Progress M1-5, a modified version of the Progress-M carrying 2.5 times more fuel in place of supplies. The second stage was the transfer of the station into a 165 × 220 km (103 × 137 mi) orbit. This was achieved with two burns of Progress M1-5''s control engines at 00:32 UTC and 02:01 UTC on 23 March 2001. After a two-orbit pause, the third and final stage of Mir''s deorbit began with the burn of Progress M1-5''s control engines and main engine at 05:08 UTC, lasting a little over 22 minutes. Reentry into Earth''s atmosphere (100 km/60 mi AMSL) of the 15-year-old space station occurred at 05:44 UTC near Nadi, Fiji. Major destruction of the station began around 05:52 UTC and most of the unburned fragments fell into the South Pacific Ocean around 06:00 UTC.

    Visiting spacecraft Main articles: Soyuz (spacecraft), Progress (spacecraft) and Space Shuttle

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