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<br>\r<br>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<br>\r<br>\r<br>\r<br>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 .
