A supernova that occurs 10,000 years from now in a galaxy 50,000 light years away will be observed on earth 60,000 years from now.
A Supernova is a powerful and luminous explosion of a dying star. A star that suddenly becomes much and much brighter because it's exploding and the radioactive element it emits travels the universe for a vey long distance, the distance could be measure in light years.
Also, the distance that light travels in one year said to be as light year, one light year is about, 9.4607×[tex]10^{12}[/tex].
Example of a supernova,
If our sun exploded as a supernova in our galaxy, the resulting shock wave probably wouldn't burn the entire earth, but the side of earth facing the sun would boil away.
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