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Does everything has mass?

  1. Apr 14, 2015 #1
    Does everything in the Universe has mass? even sub-atomic particles?
    I was watching a video on youtube, the title was "How Much Does a Shadow Weigh?", and I came up with this question
  2. jcsd
  3. Apr 14, 2015 #2


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    Most elementary particles in the standard model have mass - the bosons that carry the strong and electromagnetic force - gluons and photons respectively -- are the only things we know of that don't have a mass.

    It then follows that since everything is made of massive particles (except for light), everything has mass.
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