"Where None Have Gone Before" --SpaceX's Elon Musk Ups the Suspense on Plans to Make Humans a Spacefaring Species (WATCH Video)

"Once you have all of those four elements, you can actually go anywhere in the solar system by planet hopping or moon hopping," Elon Musk said at t June's ISS R&D conference in Washington, D.C. "So by establishing a propellant...