Earth Shaker - #AstroMeme How far is far? We often... | Facebook
One light year is defined as the distance travelled by light in one year. The speed of light is 3 × 10^8 m/s. The same in metre is?
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How far is a light-year? Plus, distances in space
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Light-year - Wikipedia
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What exists one light year away from the Earth? - Quora
