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from | Encarta |  |
Comet Hale-Bopp |
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| Comets develop one or more tails of gas and dust when they near the Sun. When Comet Hale-Bopp passed near Earth in 1996 and 1997, astronomers discovered it had three tails—two ion tails and one sodium tail. The sodium tail was not visible to the naked eye. | ||||||
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| Dennis di Cicco/Corbis | ||||||
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