Extraterrestrial life Intelligent Design Origin Of Life

OOL researcher Paul Davies: They used to make fun of me for saying Earth, Mars swapped microbes…

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A photo of one full lit side of Mars, showing the reddish brown color of its surface and a white spot on the southern side.

But they’re not laughing now:

The bombardment of the planets by comets and asteroids was far more severe in the past, especially before about 3.8 billion years ago, after which it tailed off somewhat, although it has never ceased entirely. Evidence suggests that until about 3.5 billion years ago Mars was warm and wet and far more earthlike than it is today. As we know there was life on Earth at that time, it seems inevitable that the transfer of viable organisms from Earth to Mars would have occurred, thus seeding the red planet with Earth life. Of course, the same mechanism works in reverse; indeed, it is easier to knock rocks off Mars because of its lower gravity and thinner atmosphere.

All of which raises the intriguing question of whether life on Earth may have started on Mars and come here in impact ejecta, implying that we are all the descendants of Martians. Mars does have a few favourable aspects as an incubator of life; certainly early Mars was no less congenial than early Earth for biology to get started. But whichever way around it was, it seems that if we ever find traces of life on Mars, chances are it will just be good old terrestrial life. Paul Davies, “Did Mars and Earth swap microbes?” at Cosmos Magazine

Indeed. But that raises a question. If we discover life on Mars and it turns out to be a lot like life on Earth, will that be experienced as an achievement or a disappointment? It certainly won’t prove anything like what some have hoped. Heck, it won’t even prove that We Are NOT Alone…

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See also: Should we look for patterns of life, not chemical signatures, on Mars?


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2 Replies to “OOL researcher Paul Davies: They used to make fun of me for saying Earth, Mars swapped microbes…

  1. 1
    Pearlman says:

    Could just mean Mars formed about the time earth did (creation week one) and if SPIRAL CR hypothesis and model we were closer, at some period prior, to the end of day four, so some of life here could have ended up there, just like the mass that is the moon started out here at some point prior to the end of day 3.

  2. 2
    Tom Robbins says:

    just like the sampling curve for fossils on earth suggests that the record is complete, I think we have scooped up enough Mars matter to call it dead. IF LIFE flourished on mars, there would be signs of it in every teaspoon of dirt. If you go out to your garden, and take a cm Cubed sample, you will have 10’s of thousands of microbes and maybe some fungi strands, a fossile seed something!!! Think about how many rovers and probes we have sent, how much dirt we have gathered – life and its rimnants should be abundant – have they every found oil on mars? Some sign of leftover rotten flora/fauna? No. How many spots have we been to and how many spots need to be sterile, with no signature amino acid traces or even carbon in any large quantities…. there is no life on mars, and I don’t think there ever was – it just did not hit the perfect spot needed, and did not have the right orbit, moon, nothing that would make it a designers workshop (no matter if you think its an intelligent or comatose watchmaker). We can dream all day that Mars was once like earth, but where is the evidence? There is none..

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