Scott Kelly, a former shuttle pilot and space station commander, is heading back to the orbital outpost, this time for an experimental, year-long stint.

Scott Kelly, a former shuttle pilot and space station commander, is heading back to the orbital outpost, this time for an experimental, year-long stint.

Astronaut Don Pettit's blog from the International Space Station

Astronaut Don Pettit's blog from the International Space Station

NASA astronaut and one-year crew member Scott Kelly will retire from the agency, effective April 1. Kelly joined the astronaut corps in 1996 and currently holds the American record for most time spent in space.

NASA astronaut and one-year crew member Scott Kelly will retire from the agency, effective April 1. Kelly joined the astronaut corps in 1996 and currently holds the American record for most time spent in space.

Puerto Rico 's astronaut Joe Acaba is currently at the International Space Station ! "Boricua hasta en la Luna"

Puerto Rico 's astronaut Joe Acaba is currently at the International Space Station ! "Boricua hasta en la Luna"

ESA astronauts Luca Parmitano (centre) and Thomas Pesquet (left) training together for INC-49/INC-50 ISS EVA Maintenance run, at the Neutral  Buoyancy Laboratory (NBL) near NASA's Johnson Space Center, on 16 January 2015.  Thomas Pesquet has been assigned to be launched on a Soyuz spacecraft from Baikonur Cosmodrome in Kazakhstan in 2016 for a long-duration mission to the International Space Station.

ESA astronauts Luca Parmitano (centre) and Thomas Pesquet (left) training together for INC-49/INC-50 ISS EVA Maintenance run, at the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center, on 16 January 2015. Thomas Pesquet has been assigned to be launched on a Soyuz spacecraft from Baikonur Cosmodrome in Kazakhstan in 2016 for a long-duration mission to the International Space Station.

Astronaut Twins Scott and Mark Kelly Honored with Elementary School Renaming http://whtc.co/8xbz

Astronaut Twins Scott and Mark Kelly Honored with Elementary School Renaming http://whtc.co/8xbz

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