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What exactly is a light-year. Light-year simply explained!
A light-year, is a unit of distance often used in astronomy, to measure vast distances in space. It represents the distance that light travels, in a space entirely devoid of matter, otherwise known as a vacuum, in one year. Since light moves at a speed of around 299,792 kilometres per second, the distance the light travels , in one single year ...
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包括 light-year 的结果。
是否要仅显示 lightyear 的结果?
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