Photon is a bad choice of word. Would you consider light (wave) travle in a spaces that is obsolutly nothing? When we said C light speed in a vacum, how do we really know there is nothing in there? What if light actually needs an medium (whatever that
medium is called in the future)? Just like gravity. What if it is just another medium that we can't visualize or detect yet?
That's my thought. What if there is a true vacum space that we just don't know yet? And maybe we can travel faster inside it without all those medium slowing us down. Just thinking of the possibility though.