Does the speed of light keep its consistency?

Does it slow down/speed up?

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  • 1 decade ago
    Favorite Answer

    For all practical purposes, the speed of light in a vacuum is constant. It can vary by the transmission medium, see the first reference.

    Some theorize it changed during the earliest history of the universe. See the VSL (variable speed of light) theory discussed in the second reference.

    Source(s): http://en.wikipedia.org/wiki/Refractive_index Joao Magueijo, Faster than the Speed of Light
  • 1 decade ago

    The speed of light is 186,000 miles per sec. or

    300,000 kilometers per sec.

    This value is constant.

  • 1 decade ago

    It does if it changes mediums, like going from air to water

  • 1 decade ago

    depends on the mass its obtaining

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  • 1 decade ago

    It all depends

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