Why is light affected by gravity if it has no mass?

Question

Why is light affected by gravity if it has no mass?

In: 3548

Answer 1

Because light travels through space which IS affected by gravity.

Think of space like a fiber optic tube. Light goes through the space ‘tube’ and follows it. Gravity bends the tube. (Terrible analogy but I have to add filler so automod stops deleting my comment. )

In extreme environments like a black hole, space warps back in on itself so light just keeps ending up back inside the black hole.