NASA astronauts Jeffrey Hoffman, Chris Hadfield, Jerry Linenger, Leland Melvin, Mae C. Jemison, Mike Massimino and Nicole Stott answer 50 of the most Googled questions about space. Does space ever end? Can birds fly in space? How much money do astronauts make?? ONE STRANGE ROCK premieres March 26, at 10/9c on National Geographic.