At the LHC, researchers smash particles into each other at speeds close to speed of light. Photons, on the other hand, already move at the speed of light. Do they ever smash into each other? Or do they just go through each other? Why?
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3possible duplicate of Collision of two photons – Sep 18 '13 at 08:41
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I think the answers in the duplicate are sufficient. – anna v Sep 18 '13 at 10:00
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Related: http://physics.stackexchange.com/q/1361/2451 and links therein. – Qmechanic Nov 08 '14 at 13:50