Sunday, August 06, 2006

This day in Astronomy: August 6

Ten years ago, NASA biochemist David McKay presented a Martian meteorite, named ALH84001, found to contain microscopic structures scientists surmise to be biological in origin. These structures are called polycyclic aromatic hydrocarbons, commonly produced by biological processes - the main argument used by McKay in his thesis that life could have existed in Mars, but many scientists have argued that PAHs can also be produced by non-biological means.

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