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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
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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

User Pandavenger
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Well, one light year is the distance in which light travels in one year. So, if a star is 10 light-years away from us, and it explodes today, we will know that it exploded 10 years from today.
User Panayiotis
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