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What is a light-year?
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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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Light year, light second calculation explained! - YouTube
How far is a light-year? | Astronomy Essentials | EarthSky
What is a light-year? – Exoplanet Exploration: Planets Beyond our Solar System
