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Podcast: Audio Podcasts
Episode:

Uncommon Moons
Category: Science & Medicine
Duration: 00:00:00
Publish Date: 2007-12-18 18:00:00
Description: New observations from NASA's Spitzer Space Telescope suggest that moons like Earth's -- that formed out of tremendous collisions -- are uncommon in the universe, arising at most in only 5 to 10 percent of planetary systems.
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