Rocketman (and woman): Elon and Gwynne, the pair who made SpaceX Yahoo NewsElon Musk Says It's Currently Too Expensive for Self-Sustaining City on Mars ComicBook.comNASA astronauts conduct trial run before historic launch of SpaceX rocket CBS Evening NewsSpaceX's Falcon 9 Rocket Set To Launch On Wednesday | TODAY TODAYMusk: Rocket costs must drop for 'self-sustaining city on Mars' BNNBloomberg.caView Full Coverage on Google News