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OpenStudy (anonymous):

If a star is 10 light-years away from us and it explodes today, when will we know that it exploded? today 10 years from today 10 parsecs from today

OpenStudy (anonymous):

A light-year is the distance light travels in one year. So if the star is 10 light-years away, it takes the light from the explosion 10 years to reach the Earth.

OpenStudy (anonymous):

thanks

OpenStudy (anonymous):

welcome

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