1. Apr 15, 2016 #1

   KarminValso1724

   

   For example, if photons were the size of galaxies, would they still move at the speed of light?

    

   KarminValso1724, Apr 15, 2016
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3. Apr 15, 2016 #2

   Khashishi

   

   Science Advisor

   The concept of "size" is ambiguous for particles. Photons can in principle have wavelength the size of a galaxy, and it still moves at the speed of light.
   Other particles, except gluons, have mass so they travel slower than the speed of light. Gluons can't propagate freely, so don't have a speed.

    

   Khashishi, Apr 15, 2016
4. Apr 15, 2016 #3

   ZapperZ

   

   Staff Emeritus

   Science Advisor

   Education Advisor

   Insights Author

   How were you able to measure the size of a photon in the first place?
   
   ALL light/EM radiation, by definition, travels at c in vacuum.
   
   Zz.

    

   ZapperZ, Apr 15, 2016

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