Astronomical unit - Wikipedia
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what is a light year the distance between the Earth and the Sun is 150 into 10 to the power - Science - Stars and the Solar System - 14488507 | Meritnation.com
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Earth Shaker - #AstroMeme How far is far? We often measure distances in space using astronomical units (AU) and light-years (ly) because of the superb distances. 1 Astronomical Unit (AU) - average
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What is a light-year?
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Size and Scale Background Information
