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astronomical unit |
Also found in: Dictionary/thesaurus, Medical, Financial, Acronyms, Encyclopedia, Wikipedia | 0.07 sec. |
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. |
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| The Kuiper belt extends outward from the orbit of Pluto to about 70 times the Earth-sun distance, which defines an astronomical unit (AU). To make the millions of kilometers between the planets easier to visualize, scientists use a scale called astronomical unit (AU), where 1 AU equals the distance from Earth and Sun (about 149,600,000 kilometers). An order for 56 circuit card assemblies will be followed six months later-- too late to be added to the first production run-- by an order for one or two or three of the same item at a relatively astronomical unit price. |
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astronomical unit
