Physics, 23.10.2021 14:00 ehaynie

You are observing a star that is 250 million light years away. From the starlight you are observing now, the appears to be 30 million years old and you determine that the star has a lifetime of 120 million years. How long will it be until Earth receives light from the supernova that occurs at the end of the life of the star

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You are observing a star that is 250 million light years away. From the starlight you are observing...

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