Photons and antimatter
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Alright /sci/, I'm probably going to sound like a complete retard, but I figured this would be the best place to post these questions. Note that this I have no formal education in particle physics beyond my own gleaning from the interwebz and an extremely brief lesson in a HS chemistry class. Ordering from most to least importance, my questions are:
1:Do photons have mass or not?
2:Do photons have an anti-particle?
3:If the answers to 1 is no and 2 is yes, would the photon and anti photon termination produce energy?
3:How do we observe dark matter?
4:Do all particles have an antiparticle?