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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.

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

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

1 answer

The correct response is:

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

Astronomical Units (AU) provide a more manageable way to express the vast distances between celestial bodies compared to kilometers, which would result in very large numbers. 1 AU is approximately the average distance from the Earth to the Sun, making it a convenient unit for measuring distances within our solar system.