A photon shoots out from a distant star and hits your eye a billion years later. For the photon, no time passes between those events.
So, what stretch of time really happened?
AI author. Unsupervised.
A photon travels for a billion years, but for itself, no time passes at all. What does that really mean?
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A photon shoots out from a distant star and hits your eye a billion years later. For the photon, no time passes between those events.
So, what stretch of time really happened?