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Astronomical Units (AU) are most useful in describing the distance from a planet to its sun. For just about any other purpose they're either too long (distances on a planet's surface) or too short (distances between stars) to be of much practical use.

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14y ago

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All that I know is that Au is gold, AND AU (capitals) is ASTRONOMICAL UNITS. AU is used for SPACE and means 1 AU is the distance between Earth and the Sun. That is around 149.6-150 MILLION KM. To measure the size of a galaxy, I recommend 'light years'.

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13y ago
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Q: When do you use Au for measurement?
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