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Originally Posted by raymo
Again, as I understand it, there is no proof that photons are massless;
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No, really, they are massless. As hard as it is to understand, relativisitic mass is a function of energy but still equals zero
in the reference frame of the photon.
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and if they are massless, maybe they would not interact with spacetime, and ignore the curves and sail straight through them without deviating.
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It's all about the reference frames. As far as the photon is concerned, it follows a geodesic path - a straight line when viewed from each point along the line - but from the point of view of an external observer, the path is curved (which is equal to the curvature of spacetime).
Relativity has been demonstrated to be correct by many experiments and observations .... but is still (apparently) neither complete nor sufficient (to explain everything going on in the universe).
Tell me when your head explodes.
