Image: Artist's concept of collision at HD 172555
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Description: 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.
Title: Artist's concept of collision at HD 172555
Credit: http://www.nasa.gov/multimedia/imagegallery/image_feature_1454.html
Author: NASA/JPL-Caltech
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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