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Physics 8 Online
OpenStudy (anonymous):

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

OpenStudy (anonymous):

A star is said to be 10 light years away if light from it takes 10 years to reach us or vice-versa.

OpenStudy (anonymous):

so B?

OpenStudy (anonymous):

Yup.

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