What is an Astronomical Unit (AU)?

An Astronomical Unit (AU) is a unit of length*.

1AU is defined as the average (mean) distance between the Earth and the Sun. In more familiar terms, one Astronomical Unit is roughly equal to 150 million** kilometres, or 93 million*** miles.

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*Centimetres, kilometres, miles, inches and feet are all units of length
** That's 150,000,000
*** 93,000,000


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