what is an astronomical unit ( au)? the average distance from earth to a planet in the solar system is 4au whar does that mean
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Definition of astronomical unit. For general reference, we can say that one astronomical unit (AU) represents the mean distance between the Earth and our sun. An AU is approximately 93 million miles (150 million km). It’s approximately 8 light-minutes.
More exactly, one astronomical unit (AU) = 92,955,807 miles (149,597,871 km).
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