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Fix value for AU in km + ref
The astronomical unit ([[AU]]) is the mean [[Sun]]-[[Earth]] distance, a unit of distance widely used in expressing distances in the solar system. 1 AU = 93 million miles = 150 million kilometers (approximate figures).
The astronomical unit ([[AU]]) is the mean [[Sun]]-[[Earth]] distance, a unit of distance widely used in expressing distances in the solar system. 1 AU = 149,597,870.691 km<ref>[http://www.iau.org/public/measuring/ The IAU and astronomical units] - International Astronomical Union site</ref>, or approximately 93 million miles. <!-- which mile? landmine, nautical mile, roman mile? //-->
== References ==
<references />
[[Category:Physics]]
[[Category:Physics]]
[[Category:Astronomy]]