xx asked in 科學及數學生物學 · 1 decade ago

Bacteria existance

Do bacteria that live on Earth exist on other planets?

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  • ?
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    1 decade ago
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    According to my microbiology professor, no.

    Bacteria and other lifeforms operate on enzymes and nucleic acids. Life is only possible in environments where these molecules can remain stable and functional - apparently, Venus is far too hot (no known protein/nucleic acid can remain stable at 400+ deg C), and Mars has too thin an atmosphere to protect these molecules from radiation damage - we don't even have to consider other planets because their physical characteristics are even more extreme.

    Though sometimes I wonder - these conclusions are drawn according to what we know on Earth, but there can probably be other molecules that are not formed on Earth on other planets that can create self-replicating lifeforms under another set of conditions not found on Earth. Thus, if the answer is no, that answer can also never be proven.

    Source(s): Myself
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