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Early asteroids unexpectedly crusty

Mineralogy of two meteorites chronicles formation of crust on an ancient asteroid

1:46pm, January 7, 2009

Two meteorites retrieved from West Antarctica contain a type of rock commonly found in Earth’s crust but previously unseen in meteorites. Analyses suggest that the meteorites, the oldest rocks of their type yet found, are fragments of an asteroid that coalesced early in the solar system’s history.

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