Einstein said it would take an infinite amount of energy to move something at the speed of light. Photons move at the speed of light every day, so we can infer that photons have no mass. However, a black hole has so much gravity (gravity only affects matter) even light is sucked in. Because light is sucked into a black hole, we can infer that photons have mass. WHAT?!?!? how can this be? I assume either some how photons can be propelled without an infinite amount of energy (very unlikely). Or light is sucked into a black hole for another reason besides gravity.