NASA studies astronaut twins to observe the rigors of space
Preliminary findings indicate changes in gene expression and other biological markers.
Scottkelly
NASA dominated space and social media in 2016
The space agency was a big winner despite funding woes.
Record-breaking astronaut Scott Kelly retiring this April
His space-faring days may be over, but he'll continue to help with research.
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Watch astronauts make outer space Skype calls with HoloLens
Connecting the International Space Station to Earth one call at a time.
Astronaut Scott Kelly will answer questions from space on Tumblr
Kelly is hosting 'Answer Time' live from the ISS at 1:45PM ET.
Astronaut Scott Kelly hosts a Reddit Q&A from space at 4PM ET
NASA's Space Station veteran wants you to ask him anything.
