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Light seconds, light years, light centuries: How to measure extreme distances - Yuan-Sen Ting - YouTube
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Topic: Light Years Essential Question: How do scientists use light years to measure distances in our universe? - ppt download
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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