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astronomical unit |
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astronomical unitUnit equal to the mean distance of the Earth from the Sun: 149.6 million km/92.96 million mi. It is used to describe planetary distances. Light travels this distance in approximately 8.3 minutes. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| 1 astronomical units (AU)--slightly greater than Jupiter's distance from the sun (SN: 6/16/01, p. Currently, the space object is at a distance from the sun of 97 astronomical units (AU), or the average distance from Earth to the sun. Recently, astronomers reported the surprising discovery of a very large diameter Kuiper Belt planetoid -- (90377) Sedna -- on a distant, 12,500-year-long, eccentric orbit centered approximately 500 astronomical units from the Sun. |
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Astronomical Units
