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Encyclopediaastronomical unitastronomical unit (AU), mean distance between the earth and sun; one AU is c.92,960,000 mi (149,604,970 km). The astronomical unit is the principal unit of measurement within the solar system, e.g., Mercury is just over 1/3 AU and Pluto is about 39 AU from the sun. The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved. More on astronomical unit from Infoplease:
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- Juno, in astronomy - Juno Juno , in astronomy, 3d asteroid to be discovered. It was found in 1804 by C. Harding. It has ...
- Pallas, in astronomy - Pallas Pallas , in astronomy, 2d asteroid to be discovered. It was found in 1802 by H. Olbers. The ...
- solar constant - solar constant solar constant, the average amount of radiant energy received by the earth's ...
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