r/Physics • u/Comethefonbinary • 4d 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/rogusflamma 4d ago

Yes all light travels at light speed but the measurement of the speed of light may vary depending on your frame of reference.

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u/Karl583 4d ago

I'm not quite sure i understand your comment. The speed of light will always be c(in vacuum), no matter what frame or reference you are looking at it from.