National Geographic News, Reporting Your World Daily

Thursday, October 28, 2010

Photo: Dust Older Than the Sun Found in Earth's Atmosphere


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Dust grains scooped up from Earth's atmosphere contain some of the most primitive matter known, according to an April 2009 study.

The grains, carried to Earth in the tail of a comet, contain materials that date back before the sun was born.

Image courtesy H. Busemann