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The Allan Hills meteorite, found in Antarctica in 1984, lead to speculation that bacteria from Mars may have traveled from Mars to Earth between 17 million and 13 000 years ago - blasted from Mars 17 million years ago and landing on Earth 13 000 years ago.

This is not the only situation that I have come across, over time, where scientists have mentioned that life may have originated on Mars and then seeded Earth via meteorites.

I am not disputing that life on Earth has existed for billions of years. The Allan Hills meteorite is just an example of how a chunk of Mars can end up on Earth via natural processes.

But if life were to have originated on Mars, what would make Mars a better candidate for life to originate on?

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closed as too broad by GdD, Hohmannfan Sep 19 '18 at 11:39

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ I'm not the silent, anonymous down-voter, but it would be much better if you could find one or two links showing where "...scientists have mentioned that life may have originated on Mars and then seeded Earth via meteorites." and then adding them back into your question. I don't think forgetting to add a supporting link is a "closable-offense" but it make stop reflexive question-closers from also-voting. Even something from Wikipedia would be helpful, and doing so adds additional "prior research" which is always encouraged in questions. $\endgroup$ – uhoh Sep 19 '18 at 10:04
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    $\begingroup$ Conjecturally, Mars would have cooled faster than Earth because it's smaller, further from the Sun and didn't have the giant impact that formed the Moon. As such, liquid water might have existed on Mars before Earth. $\endgroup$ – Steve Linton Sep 19 '18 at 10:08
  • $\begingroup$ I meant "close-voter" $\endgroup$ – uhoh Sep 19 '18 at 11:36

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