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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 Constants - Astronomical Constants Light-year (distance traveled by light in one year) 5,880,000,000,000 mi ...
- Astronomical Constants - Astronomical Constants Light-year (distance traveled by light in one year) 5,880,000,000,000 mi ...
- Miscellaneous Units of Measure - Miscellaneous Units of Measure acre An area of 43,560 square feet. Originally, the area a yoke of ...
- Miscellaneous Units of Measure - Miscellaneous Units of Measure acre An area of 43,560 square feet. Originally, the area a yoke of ...
- Juno, in astronomy - Juno Juno , in astronomy, 3d asteroid to be discovered. It was found in 1804 by C. Harding. It has ...
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