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*canno*t have mass.

I know that a photon

*does*carry energy, however.

So, just for fun I used E=mc

^{2}, to find out how much mass a photo

*would*have.

This was mainly just to play around with the equation, but I found the answer interesting.

1.11265005605e-31 kilograms.

That is the mass of a single photon, even though I know its not.

What I don't know is why its not.