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The astronomical unit (or au) is a unit of length, roughly the distance from Earth to the Sun. As the Earth/Sun distance varies the unit has been "fixed" at as exactly 149,597,870,700 metres (about 93 million miles)This may seem big but in terms of the universe it is pretty small. As a result it is used to measure distances in the solar system.

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Q: What is an astrominal unit?
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