Think of a trampoline, now put a bowling ball in the middle, notice it dips down around the ball. Roll a golf ball across, it will curve as it passes the dip from the bowling ball.
This is what happens to light as it goes past planets and stars, the gravity bends space like a trampoline, causing it to bend the light direction.
Now get a 1ton lead ball on the trampoline, it goes straight to the ground and the whole trampoline stretches down. Now try and roll a golf ball to the other side.
This is a black hole bending space, and the golf ball / light simply cannot get to the other side, it’s pulled down into the massive hole, or ‘gravity well’ as it’s called that it creates
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