Hmmm.

Started 1 year ago by ChadMan

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ChadMan

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http://www.news.com.au/technology/panspermia-theorists-say-indias-red-rain-contains-life-not-seen-on-earth/story-e6frfro0-1225913620448

Posted 1 year ago #
Pierre

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I'm a supporter of the panspermia theory, but not for the reasons mentioned in the article. Amino acids (the building blocks of proteins and of DNA/RNA) are present in the galactic gas/dust clouds. It seems reasonable to assume these building blocks were brought to Earth – and possible other life-bearing planets – very early in their existence.

From all current knowledge, life appeared on Earth almost immediately after it cooled enough for liquid water to be present. The delay is definitely too short for the process to be purely evolutionary (i.e., random), but can be explained by the prior existence of fully-developped building blocks.

As a consequence, it's extremely probable (IMO) that all carbon-based life in the Galaxy will be protein-based – but not necessarily DNA-based: there may be other efficient mechanisms for encoding life processes, even though none have been found as yet on our own planet. Either DNA existed from the start, or no non-DNA-based life has survived.

"If those who say bad things about me knew what I think of them, they'd say even worse." (Sacha Guitry)
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"Earth is the cradle of mankind. Nobody can live in the cradle forever" (Constantin Tsiolkovski)

Posted 1 year ago #

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