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Understanding 9/11Planetary Smash-Up
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381359main_planetImpact-full_full.jpg
This artist's concept shows a celestial body about the size of our moon slamming at great speed into a body the size of Mercury. NASA's Spitzer Space Telescope found evidence that a high-speed collision of this sort occurred a few thousand years ago around a young star, called HD 172555, still in the early stages of planet formation. The star is about 100 light-years from Earth. Image Credit: NASA/JPL-Caltech
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