International Space Station
The International Space Station (ISS) is the largest modular space station in low Earth orbit. The project involves five space agencies: the United States' NASA, Russia's Roscosmos, Japan's JAXA, Europe's ESA, and Canada's CSA. The ownership and use of the space station is established by intergovernmental treaties and agreements. The station serves as a microgravity and space environment research laboratory in which scientific research is conducted in astrobiology, astronomy, meteorology, physics, and other fields. The ISS is suited for testing the spacecraft systems and equipment required for possible future long-duration missions to the Moon and Mars. The ISS programme evolved from the Space Station Freedom, a 1984 American proposal to construct a permanently crewed Earth-orbiting station, and the contemporaneous Soviet/Russian Mir-2 proposal from 1976 with similar aims. The ISS is the ninth space station to be inhabited by crews, following the Soviet and later Russian Salyut, Almaz, and Mir stations and the American Skylab. It is the largest artificial object in the solar system and the largest satellite in low Earth orbit, regularly visible to the naked eye from Earth's surface. It maintains an orbit with an average altitude of 400 kilometres (250 mi) by means of reboost manoeuvres using the engines of the Zvezda Service Module or visiting spacecraft. The ISS circles the Earth in roughly 93 minutes, completing 15.5 orbits per day. (Credit: Wikipedia)
Outside the International Space Station, Expedition 42 Commander Barry Wilmore and Flight Engineer Terry Virts of NASA conducted their third spacewalk in eight days March 1 to install antennas and communications gear that will be used to provide rendezvous and navigational information to visiting vehicles approaching the complex in the future, including the new U.S. commercial crew vehicles. Wilmore and Virts installed about 400 feet of cable along the truss of the station as part of the new Common Communications for Visiting Vehicles (C2V2) system. In two previous spacewalks on Feb. 21 and Feb. 25, the two astronauts rigged cables for new International Docking Adapter ports that will be delivered to the complex this year and lubricated the grappling end of the Canadian-built Canadarm2 robotic arm. (Credit: NASA)
Video by NASA
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