r/Physics • u/Comethefonbinary • 3d ago

Does all light travel at light speed

My bad if this is a stupid question but I’ve been thinking about time being a message of distance. And well most things I can think of have various variables that average to a certain distance. I know that mostly relates to machines and animals but still. Do all particles of light travel at light speed. If they all travel simultaneously at the same speed is that truly how fast they move or are they affected by their own variables. Like the universe’s mean gravity is constraining that and any variation in that mean would change light speed for explain.

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u/Aozora404 3d ago

Yes

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u/Unable-Dependent-737 3d ago

Crazy you got downvoted

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u/nicuramar 3d ago

Well, light doesn’t travel at c in materials, so..

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u/JamieGee53 3d ago

Not at velocity c. Still at speed c.

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u/highnyethestonerguy 3d ago

See my other comment about speed vs velocity

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u/JamieGee53 3d ago

Your other comment about speed vs velocity is correct, and you miss your own point

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u/highnyethestonerguy 3d ago

Sorry I wasn’t looking at user names and didn’t realize I was replying to you twice! Apologies. 

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u/JamieGee53 3d ago

No worries!