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Last Post 29 Oct 2018 08:07 AM by  Terry Kucera
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26 Oct 2018 02:50 PM
    Does the speed of light ever change?
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    29 Oct 2018 08:07 AM
    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:

    Light does move more slowly than that, though, when it is moving though materials of some sort rather than a vacuum.
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