4 ms·

Or ... do we have Mars-based DNA?

• jerf 8y ago
  I've seen the theory tossed out there, but it's hard to do anything about it. We'd need paleontologists on Mars to really be sure (to prove life that predates Earth, as a step 1), and we're a long way away from that no matter how you slice it. But as I understand it, the time scales work; for the same reason that Mars is basically a dried-up, used up planet now while Earth is flourishing with life, Mars was theoretically possibly habitable much earlier than Earth.