Define one astronomical unit. Give its value in metre.
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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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a unit of measurement equal to 149.6 million kilometres, the mean distance from the centre of the earth to the centre of the sun
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