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4 March, 02:34

What is an astronomical unit (AU) ?

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  1. 4 March, 04:47
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    The AU is the Earth's average distance from the sun. It's a handy unit for things in the solar system and a little bit farther, but it's way too small for distances outside the solar system and between stars. That's where you need light years, megaparsecs, and units like that.
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