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HomeOff the CuffAsteroid that formed moon's Imbrium Basin may have been protoplanet-sized

Asteroid that formed moon's Imbrium Basin may have been protoplanet-sized

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The asteroid that slammed into the moon 3.8 billion years ago creating the Imbrium Basin may have had a diameter of at least 150 miles, according to a new estimate. The work helps explain puzzling geological features on the moon’s near side, and has implications for understanding the evolution of the early solar system.
(via WSJ Blogs)