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Not necessarily. Impacts have ejected material that ended up on the other of Mars and Earth. Life might have travelled on it and thereby life on both planets co
by _Microft 7y ago
Not necessarily. Impacts have ejected material that ended up on the other of Mars and Earth. Life might have travelled on it and thereby life on both planets could have a common ancestor.
https://en.wikipedia.org/wiki/Martian_meteorite https://en.wikipedia.org/wiki/Martian_meteorite
- thom 7y agoIt's worth pointing out that this _should_ probably increase your estimate from the Drake equation slightly. It means that even if organic 'early life' compounds can arise on planets that nevertheless aren't suited to more complex life, they could still spread to planets that _are_ suited, but don't necessarily have those compounds yet.