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Question
Why do astronomers use astronomical units (AU) instead of kilometers (km)?(1 point)
Responses
AU is used in astronomy, while km is used in physics.
AU is used in astronomy, while km is used in physics.
Large distances are easier to express in AU than in km.
Large distances are easier to express in AU than in km.
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
1 answer
The correct response is:
Large distances are easier to express in AU than in km.
Astronomical units are specifically designed to measure the vast distances within our solar system, making it easier to compare those distances without using very large numbers. For example, the average distance from the Earth to the Sun is 1 AU, whereas the same distance in kilometers is approximately 149.6 million kilometers.
