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Not entirely unnecessary. It's a big question as to why life started on Earth as soon as it did, pretty much as soon as it was even possible. That could be be
by MattPalmer1086 4y ago
Not entirely unnecessary.
It's a big question as to why life started on Earth as soon as it did, pretty much as soon as it was even possible.
That could be because life is very easy to start if conditions are right. In which case it's quite likely to have started on early Mars too, and we should expect to find at least simple life all over the place.
The other possibility is that it didn't start on Earth, and was seeded from somewhere else.
- varjag 4y agoWhy not add more steps? The aliens¹ brought microbial life on an interstellar ship and seeded it. A lot better chance than riding out for a few million years on a piece of rock! See, it's approximately on the same trailing end of unlikely as panspermia, but I fancy this one more. ¹Let's call them Engineers
- AareyBaba 4y agoThe big question is how local regions of low entropy that exhibit metabolism and replication (ie. life) came into existance out of inanimate matter. Where it happened is secondary.
- MattPalmer1086 4y agoYes, that is the biggest question. Understanding where it happened may give us some clues of course.