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A star is ten...

Question

A star is ten light-years away from the earth. Suppose it brightens up suddenly today. After how much time shall we see this change?

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Solution

One light-year is the distance traveled by the light in one year.
Since the star is ten light-years away from earth, any disturbance will take 10 years to reach earth.
Therefore, the brightness of the star will be seen after 10 years.

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