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A comment on How microbes survive clean rooms and contaminate spacecraft. Parent comment

Re:How microbes survive clean rooms and contaminate spacecraft by danieltillett on Sunday June 03, 2018 @11:50PM (#17224453)
Even if the probe was not contaminated the planets already are. We are likely to find that there is life on Mars (underground) and it looks just like life on Earth.

One interesting theory is that life originated outside the Earth (say on Mars) and was transported to Earth at a later time. This theory would explain why LUCA [0] is so complex and why life appears almost as soon the Earth had liquid water [1].

0. https://en.wikipedia.org/wiki/Last_universal_common_ancestor

1. https://en.wikipedia.org/wiki/Earliest_known_life_forms

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Re:How microbes survive clean rooms and contaminate spacecraft by colanderman on Thursday June 07, 2018 @07:34PM (#17261317)
Yes, but you can't test that hypothesis if the probe is contaminated. Science isn't about assuming likely things to be true.
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Re:How microbes survive clean rooms and contaminate spacecraft by gruez on Monday June 04, 2018 @12:18PM (#17229372)
>This theory would explain why LUCA [0] is so complex and why life appears almost as soon the Earth had liquid water [1].

from the wikipedia article:

>LUCA should not be assumed to be the first living organism on Earth

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Re:How microbes survive clean rooms and contaminate spacecraft by danieltillett on Monday June 04, 2018 @04:58PM (#17232385)
On the other hand it should not be assume that it is not. The complexity of LUCA is a problem since LUCA is not much less complex than a modern bacteria which is very, very complex.
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