Thu, August 13, 2009
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NASA animation of a giant impact

2009-08-13 09:05:19 GMT2009-08-13 17:05:19 (Beijing Time)  SINA.com

This animation, from NASA/JPL-Caltech, depicts an object the size of the Moon impacting a planet the size of Mercury. This is based on observations of the Spitzer Space Telescope.

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