Elon Musk @elonmusk
@PPathole @Erdayastronaut @farrier_nyker @GeetPurohit3 @YoavOffek Looks about right. Ice mining/refining on Mars & maximizing total system efficiency will be hard. CO2 is easy, as Mars atmosphere is mostly that. Also has good amount of N2, which is important for life. — PolitiTweet.org