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Dvorkam t1_ja73a6a wrote

Reply to comment by SurprisedPotato in Eli5: how old is a photon from the sun when it arrives to the earth? by Opposite-Shoulder260

I was planning to write something like this, but you beat me to it. I really like this idea, that from the perspective of photon, there is no such thing as vacuum. Every atom along its trajectory(from the "perspective" of photon) is right next to each other.

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phunkydroid t1_ja8phat wrote

From the perspective of the photon, there is no journey at all. It begins and ends at the same moment with zero time or distance in between. This is why a photon's "point of view" is just not a valid reference frame for any measurement.

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