how can a black hole suck in light?
It doesn't suck in light, it bends it's direction. As Einstein's theory of general relativity states, all mass causes an indentation in the fabric of time and space. Light simply follows straight lines on that bent fabric. The effect, for outside observers, is the light changing direction, possibly falling into the black hole, but not necessarily.
The gravity of black hole is just so big that the light turns of from its normal directions and gets sucked in the hole.
it doesnt suck it in, light is curved around it.It is like curving light into its path like a ring on fired inside a mountain , the only thing you could detect is th heat in form of radiation coming out.
