planet.3.Astar 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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asked Dec 21, 2019 157k views

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planet.3.Astar is 10 light years away from the earth. Suppose it brightens up suddenly today, after how long can we see this change?

Physics
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GDroid asked

by GDroid

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After 10 years, I guess.

Mandelbrotter answered Dec 25, 2019

by Mandelbrotter

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