If Proxima Centauri, located 4.24 light-years away, suddenly ceased burning, how long would it take for Earth to become aware of this event?

Answer

Over four years

Since Proxima Centauri is 4.24 light-years away, the last light photons emitted from the star before it ceased burning would take 4.24 years to reach Earth.

If Proxima Centauri, located 4.24 light-years away, suddenly ceased burning, how long would it take for Earth to become aware of this event?
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