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15 July, 11:04

An astronomical unit (AU) is equal to which of the following?

A. the mean distance between Earth and Alpha Centauri

B. the length of the semimajor axis of our solar system

C. the mean radius of all observable spiral galaxies

D. the mean distance between Earth and the Sun

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  1. 15 July, 13:12
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    D The mean distance between earth and the sun
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