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How can a particle exist if it don't have any mass?

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That just seems... weird ... to me...

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  1. it most likely has mass, just the number is SO small in most calculations its mass is considered zero, like an electron.


  2. it exists when observed. yahoo. that is SO deep.

  3. http://space.newscientist.com/article/dn...

  4. i know.. but paris hilton exists doesnt she?
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