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Why do astronomers use astronomical units (AU) instead of kilometers (km)?(1 point)

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

There are no km in outer space, only AU.
There are no km in outer space, only AU.

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

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

1 answer

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