Why do astronomers use astronomical units (AU) instead of kilometres when describing distances in the Solar System?
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Question

Why do astronomers use  astronomical units (AU)  instead of kilometres when describing distances in the Solar System?
Select one:

Accepted Answer

AUs make the large distances between planets easier to compare

Answer

AUs are more accurate than kilometres

Answer

Kilometres are not an SI unit

Answer

Kilometres can only be used on Earth

Answer

AUs are required for all scientific calculations

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