As Scott Kelly prepares to retire, take a look at the most stunning photos he took in space: https://t.co/Sf6OI1dJfT http://pic.twitter.com/LqHay91R3O
— National Geographic (@NatGeo) April 4, 2016
via Twitter https://twitter.com/NatGeo
April 04, 2016 at 11:00PM
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