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Physics, 26.05.2021 01:20 brooklynunderwood46
Because cosmic distances are so vast, astronomers use light-years as their unit of distance. One light-year is defined as . The nearest star is a little more than light-years away from us. When we see light from a galaxy 2 million light-years away, it has taken to reach us. Light from the Sun takes to reach us.
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Because cosmic distances are so vast, astronomers use light-years as their unit of distance. One lig...
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