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Published online 10 April 2008 | Nature | doi:10.1038/news.2008.749
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Sediments reveal past blasts
New method evaluates past meteorite strikes from changes in sea chemistry.
Ancient meteorite impacts can be detected from minute changes in the composition of sea water, according to American researchers.
By analysing changes in the ratio of osmium isotopes you can work out the timings of past impacts of stony meteorites called chondrites.
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Wonderful.