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AU and light-years are simply two different units of length, used in astronomy. The units are of different sizes. You can invent lots of other differences if you like, but basically, that's the difference - their size. Other differences might include how they are defined; and in what cases they are typically used.

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9y ago
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9y ago

A light years is much larger. 1 light year is about 63,000 AU.

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Q: In what two ways are AUs and light years different?
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5.5 light years equates to 347,818.194 AU (Astronomical Units).

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