This is how meteorite SaU 169 looked when its discoverers initially inspected it in the lab. The maximum dimension is 7 centimeters, or not quite 3 inches. (Photo: Peter Vollenweider)
Photo from the joint Swiss - Omani meteorite search expedition in 2002 (Photo: Edwin Gnos)
Scientists have pinpointed the source of a meteorite from the moon for the first time. Their unique meteorite records four separate lunar impacts.
They are the first to precisely date Mare Imbrium, the youngest of the large meteorite craters on the moon. That date, 3.9 billion years ago, is a new key date for lunar and even terrestrial stratigraphy, the scientists say, because life on Earth would have evolved only after heavy meteorite bombardment ended.
Geologists who found the meteorite and scientists from Swiss, Swedish, German, British, and Arizona laboratories who analyzed the unique stone report their work in the July 30 issue of Science. Swiss geologist Edwin Gnos is first author of the article titled "Pinpointing the Source of Lunar Meteorite: Implications for the Evolution of the Moon."
Lori Stiles | EurekAlert!
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