this post was submitted on 08 Mar 2024
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Showerthoughts

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Gravitational force is never truly zero. If it has mass, it is pulling at you, though it may be so close to zero that you don't realize it.

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[–] [email protected] 15 points 8 months ago (1 children)

Technically the photon is being absorbed and re-emitted inside the star, so it's not exactly the same photon.

[–] [email protected] 3 points 8 months ago (2 children)

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.

[–] [email protected] 4 points 8 months ago (1 children)

That's not really the same thing, as well as being afaik straight up wrong

[–] [email protected] 2 points 8 months ago (1 children)

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?

[–] [email protected] 2 points 8 months ago (1 children)

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?

[–] [email protected] 2 points 8 months ago (1 children)

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.

[–] [email protected] 3 points 8 months ago

Hmm, yeah makes sense

[–] [email protected] 3 points 8 months ago

I'm not smart enough to understand that, but I'll believe you. :D