Crazy fun US (retired) Astronaut/consultant. Helping w/STEM, S Media Q&A/space, love NASA, inventor of Twitpic POTD! http://t.co/vrpaKgQLyW
1300 days ago
Richat Structure, Mauritania...so interesting in the rings and colors...don't you agree?
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Amazing photo, Clay! Really interesting!
amazing picture! it's almost unbelievable the fact that this is our planet! looks awesome! thanks
someone threw a stone into the water!
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