Space Travel Quotes

"To our knowledge, life exists on only one planet, Earth. If something bad happens, it's gone. I think we should establish life on another planet--Mars in particular--but we're not making very good progress. SpaceX is intended to make that happen." "If humanity doesn't land on Mars in my lifetime, I would be very disappointed." "The feeling is constantly growing on me that I had been the first to hear the greeting of one planet to another."