That is the speed of light in a vacuum.

…one second corresponds to the distance light covers in one second. In short, everything in the room around you propagate at exactly 299,792,458 metres per second in spacetime. The trajectory traced out by an object in this structure is called its worldline.
A Mathematical Understanding of General Relativity: The General Concept (2/9)
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EO Scientist
gravity well (Rob Tomlin)
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Feb 5, 2023
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That is the speed of light in a vacuum. Light is slower in different things such as glass and water.
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Written by gravity well (Rob Tomlin)2.2K Followers
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