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from | Encarta |  |
Earth’s Moon |
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| The Moon, Earth’s only natural satellite, orbits Earth about once every 27 days. Among the planets in the solar system, only two—Mercury and Venus—lack natural satellites. Several planets have multiple satellites; Jupiter and Saturn have the most. | ||||||
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| John Sanford/Science Source/Photo Researchers, Inc. | ||||||
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| Appears in these articles: | ||||||
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| Crater; Mathematics; Moon; Lunar Orbiter | ||||||
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