Date: 2013-11-25 09:33 pm (UTC)
The alternative explanation for the rapid origin of life on Earth is that the conditions for which OoL were possible only last a short time. So, if life is to originate at all, it must happen quickly.

If Mars has life, we can't rule out the possibility (the probability, actually) of contamination from the early Earth (or vice versa). There were lots of impacts in the early solar system, which would have sent lots of rocks into solar orbit to carry simple cells back and forth.
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