45107cbe_s___Physics___Particle_Physics__Answer
[Date Answered] June 22, 1999 [Questioner (age, location)] Teressa (Alaska) [Question] If light is not made of matter, how can gravity effect it? How can it be sucked into black holes if it has no mass? [Answer] 
Photons of light are affected by gravity because gravitational fields change the shape of space-time. The curvature of space-time causes a beam of photons to bend. A black hole is very dense, and has a very strong gravitational field. This warps space-time greatly, bending the light inward. In fact, the light is bent so severely that it cannot escape.
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