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mk  ·  4672 days ago  ·  link  ·    ·  parent  ·  post: Waiting on Curiosity's finding

My bet is that it is DNA-based. I see life acting as a sticky opportunist. Once a planet has it on it, it will be very difficult to get it off. Mars was warm and wet for quite some time. Large impacts on either could have exchanged life-carrying matter between the two.

A very interesting possibility is that life started on Mars, and it was Earth that was contaminated.