Happy Birthday to Mir

On this day in 1986, the Soviet Union launched Mir, the first modular space station, the largest spacecraft by mass at that time, and the largest artificial satellite until the International Space Station (ISS) in 1998.

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Assembled in orbit from 1986 to 1996, the station was the result of efforts to improve upon the Soviet Salyut program, which produced history’s first space station. It served as a microgravity research laboratory where crews conducted experiments in biology, human biology, physics, astronomy, meteorology, and spacecraft systems, all with the ultimate goal of preparing humanity for the permanent occupation of space.

Through the “Intercosmos” program, Mir also helped train and host cosmonauts from other countries, including Syria, Bulgaria, Afghanistan, France, Germany, and Canada.

Mir was the first continuously inhabited long-term research station in orbit and held the record for the longest continuous human presence in space at 3,644 days (roughly 10 years), until it was surpassed by the ISS in 2010. It also 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.

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This is all the more remarkable considering that Mir lasted three times longer than planned, and even survived the Soviet Union itself, which collapsed just years after it was launched. The fact that Russia managed to keep it afloat despite its tumultuous post-Soviet transition speaks to both ingenuity and the goodwill of global partners like NASA.

In fact, the U.S. had planned to launch its own rival station, Freedom, while the Soviets were working on Mir-2 as a successor. But both countries faced budget constraints and a lack of political will that ultimately quashed these projects. Instead, the erstwhile rivals came together through the Shuttle–Mir, an 11-mission space program that involved American Space Shuttles visiting Mir, Russian cosmonauts flying on the Shuttle, and an American astronaut flying aboard a Russian Soyuz spacecraft for long range expeditions aboard Mir.

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With various other nations, from Canada to Japan, also cancelling their own space station programs due to budget constraints, Russia and the U.S. soon brought them into the fold to create a new international space station—today the ISS we all know and love.

Thus, by the time the aging Mir was finally cut loose and allowed to deorbit in 2001, the ISS had already begun taking occupants, building upon the old station’s technical, scientific, and political legacy. (In fact, Russia has contributed most portions of the ISS after the U.S., and both its spaceport and its spacecraft serve as the primary—and for many years, only—source of crew and supplies.)

In its detailed tribute to Mir, NASA notes its importance to all of humanity as a milestone for human space exploration:

“The Russian Space Station Mir endured 15 years in orbit, three times its planned lifetime. It outlasted the Soviet Union, that launched it into space. It hosted scores of crewmembers and international visitors. It raised the first crop of wheat to be grown from seed to seed in outer space. It was the scene of joyous reunions, feats of courage, moments of panic, and months of grim determination. It suffered dangerous fires, a nearly catastrophic collision, and darkened periods of out-of-control tumbling.

Mir soared as a symbol of Russia’s past space glories and her potential future as a leader in space. And it served as the stage—history’s highest stage—for the first large-scale, technical partnership between Russia and the United States after a half-century of mutual antagonism.”

Despite all the geopolitical rivalry and grandstanding that motivated incredible breakthroughs like Mir (and for that matter the Moon landing), the value and legacy of these achievements go far beyond whatever small-mindedness spurred them. Wrapped up in all this brinkmanship was—and still is—a vision of progress for all of humanity.

A fun note about the name: The word mir is Russian for “peace”, “world”, or “village”, and has historical significance: When Tsar Alexander II abolished serfdom (virtual slavery) in 1861, freeing over 23 million people, mir was used to describe peasant communities that thereafter managed to actually own their land, rather than being tied to the land of their lord.

Photos courtesy of Wikimedia.

The International Space Station

One of Wikipedia’s latest featured photos: the International Space Station (ISS), taken in 2011 by Italian astronaut Paolo Nespoli from a departing Russian Soyuz spacecraft, while the ISS was docked Space Shuttle Endeavor. It is the largest human-made body in low Earth orbit and can often be seen with the naked eye from Earth, making close to sixteen rotations around Earth daily.

First sent into low Earth orbit in 1998, the space station has been continuously inhabited since 2000; though the last component was fitted in 2011, the station continues to be expanded and developed, with more additions planned for next year. The ISS operated jointly by the American, Russian, Japanese, European, and Canadian space agencies, and has been visited by personnel from seventeen nations. Its ownership and use is governed by various treaties and agreements.

The station is divided primarily between the Russian Orbital Segment (ROS) and the U.S. Orbital Segment (USOS). It also consists of pressurized modules, external trusses, solar arrays, and a microgravity and space environment research lab where crew members conduct experiments in biology, physics, astronomy, meteorology, and many other fields. It is also suited for testing spacecraft and equipment required for lunar and Martian missions.

The ISS has been serviced by a variety of spacecraft, including the Russian Soyuz and Progress, the American Dragon and Cygnus, the Japanese H-II Transfer Vehicle, and formerly the American Space Shuttle and the European Automated Transfer Vehicle. Since 2011, the Soyuz has been the sole means to transfer personnel, while the Dragon is the only provider of bulk cargo return to Earth.

The ISS is the ninth space station to be inhabited by crews, and only the second not to be Russian, following the Soviet / Russian Salyut, Almaz, and Mir stations and the American Skylab. It also surpassed the record for longest continuous human presence in low Earth orbit, having surpassed Mir’s record of nine years and 357 days.

The station is expected to operate until at least 2028, with the American portion being funded until 2025 and the Russian portion until 2024. Both Russia and America have discussed developing an ISS replacement, although NASA has yet to confirm for certain if this will happen; for their part, the Russians have proposed using elements of their section for a new Russian space station, OPSEK.

The ISS is an enduring, if limited, demonstration of the fruits of global cooperation in space exploration. Various other rising space powers, including Brazil, China, and India have also discussed joining the project, or devising their own space stations.