Speed of light not so constant after all

Even in vacuum conditions, light can move slower than its maximum speed depending on the structure of its pulses.

New observations show that the Universe might not be expanding at

Volksbahn MY (@VBT_MY) / X

How fast does light travel?, The speed of light

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SPEED OF LIGHT: Biggest Mystery of the Universe by Louise Riofrio

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Observable universe - Wikipedia

Solved How does the speed of light in a vacuum change if you

If creationism is true then wouldn't the observable universe only

1 + 1)-dimensional Milne spacetime. When x is not compactified

What is time?