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Last Post 10/29/2018 7:07 AM by Terry Kucera

Light

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Moena

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10/26/2018 1:50 PM
Does the speed of light ever change?

Terry Kucera

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Posts:328

10/29/2018 7:07 AM
Hi, The speed of light in a vacuum (i.e., empty space), is a constant at a terrifically fast 186,282 miles per second (299,792 kilometers per second)! Generally scientist think of it as unchanging, but see this discussion here about the subject: http://curious.astro.corn...niverse-intermediate Light does move more slowly than that, though, when it is moving though materials of some sort rather than a vacuum.