Do Massless Particles Travel at Light Speed?

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jayaramas
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do all mass less particles travel at the speed of light?
 

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Doc Al said:
Yes.

Why?
 
Why?

PHRAK...Stop teasing Doc Al!

Best answer I know: that's what we observe.
 
But I was just getting started...

First we have "particles" and they're "moving", and this is supposed to be physics 200 years after Newton.
 

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