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astronomical unit |
Also found in: Encyclopedia, Wikipedia, Hutchinson | 0.04 sec. |
astronomical unit Noun a unit of distance equal to the average distance between the earth and the sun (1.495 × 1011m)
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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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