Ask an Astronomer
NASA's Spitzer Science Center / IPAC / NASA / Caltech
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M51 and Gizmo in "Half-Baked Plan"
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Posted Nov 5, 2007 at 12:00 am.
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In this animated 'Ask an Astronomer' special, innocent alien M51 moves the Earth into a closer orbit around the sun, and learns an important lesson about life in the Universe.
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