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There are very few stars visible to the unaided eye in the night sky of Earth that are 3,000 light years (LY) from Earth. Wikipedia has a list of "brightest stars" which includes the Sun and 92 other stars which have the greatest apparent brightness as seen from Earth. When the list is sorted by distance I find that only six are more than one ...


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It is not possible to know. The speed of light is the speed of information. The information "the star has exploded" cannot travel faster than the speed of light, so there is no way to know that a star has gone supernova before that information reaches us. Usually the first particles to reach us from a supernova are actually neutrinos, which can ...


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