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
Short answer: No
Long answer: A photon’s frame of reference (i.e what would a hypothetical observer riding along with a photon experience) is not ordinary. The notion of space and time as we know it, does not exist. The closest way of imagining it is to say time stops i.e beginning is the middle is the end and there’s no difference along the path. The reason why this frame of reference is not ordinary is because it’s not an inertial frame of reference and the act of measurement itself is not possible.
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