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20 October, 21:39

A star is 10 light years away from the earth. suppose it brightens up suddenly today, after how long can we see this change?

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  1. 20 October, 21:53
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    We will see the star brighten up 10 years later, because it takes 10 years for the light emitted from that star to reach the earth.

    Light year = the distance light can travel in 1 year

    10 light years = distance that takes light 10 years to travel
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