The Willamette Meteorite, the largest ever found in the United States (15 tons)

The Willamette Meteorite, the largest ever found in the United States (15 tons)

© Denis Finnin, American Museum of Natural History.

The Willamette Meteorite is probably a fragment from the core of an ancient planet that broke up as it orbited the sun. Its structure suggests that it sustained at least two high-energy impacts in space before it fell to Earth's surface and weathered further.

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