If a photon travelled a billion light years to come to Earth, how do those billion years pass from the photon’s perspective?
In: Physics
No, photons do not experience time at all. The closer you go to light speed the “slower” time moves at light speed time stops.
From a photons perspective all things are instantaneous. The photons leaves the star 2 billion light years away and hits your eye at the same instant. The star and your eye are also infinity close together from the perspective of the photon.
TL;RD relativity is a hell of a drug
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