schweinhundert writes "Last week saw the suggestion at a geochemistry conference that life may have been more likely to start on Mars than on Earth due to the presence of molybdenite minerals. This week comes another argument, from Christopher Adcock of University of Nevada Las Vegas, published in Nature Geoscience (paywall), that Mars is likely where chemical evolution began, because Earth lacked a good source of usable phosphorous. Not so fast, says geochemist, Matthew Pasek of University of South Florida, in the same issue of the journal. The Earth had a large number of phosphorous bearing meteorites called schreibersite, which recently has been shown to phosphorylate organic molecules in his lab."
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