For the second year in a row, NASA is participating in ComicCon International in San Diego. NASA experts will take part in two panel discussions during the .\r
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Come fly with me! On Sept. 15, I completed 2736 orbits around the world traveling 72 million miles on my Year In Space. Im halfway home. By the end of this .\r
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Continuing his yearlong mission aboard the ISS, the NASA astronaut discusses the toll of living in space and his passion for taking pictures. » Subscribe to NBC .
