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A question about light

  1. Sep 12, 2005 #1
    i'm wondering something... does light have any mass?
  2. jcsd
  3. Sep 12, 2005 #2


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    Light has no rest mass. However, it has energy and is affected by gravity as if it had mass.
  4. Sep 13, 2005 #3
    Light also has momnetum. Its affected by gravity due to the curvature of space time that masses produce.
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