this post was submitted on 08 Mar 2024
142 points (91.8% liked)
Showerthoughts
29793 readers
796 users here now
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
Rules
- All posts must be showerthoughts
- The entire showerthought must be in the title
- Avoid politics
- 3.1) NEW RULE as of 5 Nov 2024, trying it out
- 3.2) Political posts often end up being circle jerks (not offering unique perspective) or enflaming (too much work for mods).
- 3.3) Try c/politicaldiscussion, volunteer as a mod here, or start your own community.
- Posts must be original/unique
- Adhere to Lemmy's Code of Conduct
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Any given star is constantly emitting an unimaginably large, but finite, number of photons. A tiny few of them travel tens to hundreds of (Earth) years, only to end their journey in your eyeballs.
Even crazier when you consider how long that photon bounced around inside the star before escaping out into space
Technically the photon is being absorbed and re-emitted inside the star, so it's not exactly the same photon.
A “photon” is basically just the universe producing a new field in response to an existing one, repeatedly. So photons travel through space in much the same way: they are absorbed and emitted by successive regions of space, with each region being the photon’s wavelength in size.
That's not really the same thing, as well as being afaik straight up wrong
Can you describe exactly how it is wrong, or is it just a feeling? Are you not familiar with the structure of an electromagnetic wave?
I'm familiar with the structure, but don't the electrical and magnetic waves smoothly translate across space? They aren't "absorbed and emitted by successive regions of space", right?
If you graph the electric field strength along a photon’s flight path, there are points where it is zero. Same for the magnetic field strength.
The energy of the photon is transformed continuously between electric and magnetic field potential, and if you consider either of those signals the energy is coming into and going out of that medium repeatedly.
Because each of those non-zero periods of field potential happens in a particular spot in space (those fields don’t move; they grow and fade in sequence), I’m saying that region of space has absorbed the photon.
Of course, you know, particle wave duality. So in some ways they travel smoothly as well.
Hmm, yeah makes sense
I'm not smart enough to understand that, but I'll believe you. :D
Screw photons, neutrinos are where the real numbers start racking up
And from the photon's perspective, it all happened in an instant 🤯