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Approach the subject from a logical viewpoint. Paul suggests that if light had mass and was influenced by a gravitational field then it would lose mass i.e. becomes lighter, but, as he states later in the post the marble shot into space would not lose mass... but neither would the photon. Photons of light can't be propelling themselves otherwise they would be accelerating (or they've got cruise control) and therefore must have been ejected from whence they came (we might have to call this the marble theory), therefore they would not lose any mass (if they had any to start with). Focus on the key aspect does light have mass. If light has any mass (EVEN INFINITESIMALLY SMALL MASS) then our assumptions of space and time bending light are not necessarily correct.
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