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Speed of light

  1. Apr 21, 2013 #1


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    Gold Member

    How can one say that speed of light is constant.Is there any possibilities of speeds greater the c.If Yes/no then why?
  2. jcsd
  3. Apr 21, 2013 #2


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    Staff: Mentor

    1. It's been measured. Lots of times.
    2. Not for ordinary matter. There are some hypothetical exotic particles that may exceed C though.
  4. Apr 21, 2013 #3


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    Gold Member

    Thank you russ_watters
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