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Formic acid, a molecule implicated in the origins of life, has been found at record levels on a meteorite that fell into a Canadian lake in 2000.
Cold temperatures on Tagish Lake prevented the volatile chemical from dissipating quickly.
An analysis showed four times more formic acid in the fragments than has been recorded on previous meteorites.
The researchers told a meeting of the American Geophysical Union that the formic acid was extraterrestrial.
Formic acid is one of a group of compounds dubbed "organics", because they are rich in carbon.
"We are lucky that the meteorite was untouched by humans hands, avoiding contamination by organic compounds that we have on our fingers," said Dr Christopher Herd, the curator of the University of Alberta's meteorite collection.
Samples of the meteorite totalling 850 grams were collected from Tagish Lake in Canada, purchased in 2006 by a consortium including the Royal Ontario Museum and recently subjected to chemical analysis.
The scientists found levels of formic acid four times higher than had previously been recorded on a meteorite. Studies have until recently focused on the Murchison meteorite that landed in a town of that name in Australia in 1969.