Why do astronomers use astronomical units (AU) instead of kilometers (km)?(1 point) A There are no km in outer space, only AU.

B AU is used in astronomy, while km is used in physics.

C Large distances are easier to express in AU than in km.

D AU is used for spacing, while km is used for length.

C

Explanation:

Large distances are easier to express in AU than in km. Hope this helps :)

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