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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:
- astronomical unit: meaning and definitions - astronomical unit: Definition and Pronunciation
- Suggestions for spelling of encyclopedia/astronomical unit - The Infoplease spelling checker combines spelling help with our dictionary and thesaurus
- Astronomical Constants - Astronomical Constants Light-year (distance traveled by light in one year) 5,880,000,000,000 mi ...
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- Pallas, in astronomy - Pallas Pallas , in astronomy, 2d asteroid to be discovered. It was found in 1802 by H. Olbers. The ...
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