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View Diary: Stellar Evolution Measured on Earth: Clues from Ti-44 "Nuclear Fossils" (53 comments)

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  •  deuterium and life (2+ / 0-)
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    NNadir, Uncle Cosmo

    There are many fundamental ratios which have a suspiciously anthropic smell (especially the small cosmological constant) but the H/D ratio ain't one of them. Seriously- think about it a minute. On earth you've got life adapted to an enormous range of temperature, pressure, redox potential, salinity, pH,.... Yet you think that life couldn't have adapted to D, presumably because its lower zero-point motion gives slightly different rates and equilibrium constants than H? The reason life can't deal with much D is obvious- on earth it hasn't had the opportunity. Compared to actual evolutionary challenges, adapting to D would be trivial, given a reasonable amount of time.

    Michael Weissman UID 197542

    by docmidwest on Tue Jun 07, 2011 at 08:31:27 PM PDT

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