541
The life of a photon
(lemmy.world)
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 13 Aug 2023
541 points (93.6% liked)
Memes
45536 readers
198 users here now
Rules:
- Be civil and nice.
- Try not to excessively repost, as a rule of thumb, wait at least 2 months to do it if you have to.
founded 5 years ago
MODERATORS
Photons exist, so there is the perspective of a photon. Most may not be absorbed but that's irrelevant because some are. And when they are, their perspective - like them - ends. Like yours does when you die.
The photon does not experience time, but we do, so from our perspective they can be emitted and absorbed even though from their perspective they are timeless. Again, like us. Before you were born, you didn't experience being not alive. From your own perspective, you've always existed, even though from the perspective of someone older than you, there was a time when you didn't.
I was using the wrong term. Photons don't have a frame of reference.
But even from the colloquial definition, photons don't have perspective. They don't live and die because they never experience time. If you had their point of view, your beginning and end would happen simultaneously, meaning you wouldn't experience anything. They are immutable particles whose only interactions are emission and absorption.
I just want to say how much I appreciate those discussion. They remind me of how little I know even though I'm considered an "expert" in my field of work.
There's a difference between time not passing and not existing. To a photon, space (in the direction of its movement) doesn't exist, as its origin and destination points are the same. But time does not pass - the axis of time is there, but the photon never budges in either direction, like a rock buried in the middle of the desert doesn't move in any spatial direction on a human timescale. The photon's beginning and end aren't simultaneous, quite the opposite. Since it can't move in time, they might as well be infinitely far apart.