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Space Station A pair of astronauts is exploring breathing risks during long term space missions today while a trio of crew members is packing a Soyuz spacecraft for the return home. NASA astronaut and two-time space station resident Tim Kopra joined first-time British astronaut for the Airway Monitoring experiment. That study explores the risk of breathing in toxic dust during future crewed missions to Mars which can possibly upset a crew member’s respiratory system. Kopra and Peake will be staying in space until June with cosmonaut Yuri Malenchenko. Station Commander Scott Kelly and Flight Engineer Mikhail Kornienko are set to complete 340 days in space when they land in Kazakhstan on March 1 U.S. time. NASA astronaut Scott Kelly (left) and Russian cosmonaut Mikhail Kornienko marked their 300th consecutive day aboard the International Space Station on Jan. 21, 2016. Three International Space Station crew members, two of whom have been in orbit nearly a year, will complete their stay in space March 1.