If light has no mass, how does gravitational force bend light inwards

Question

In the case of black holes, lights are pulled into by great gravitational force exerted by the dying stars (which forms into a black hole). If light has no mass, how is light affected by gravity?

In: 784

Answer 1

ELI5 version: race cars can go anywhere but if you watch a race, they just keep going in circles. Circles aren’t a limitation on the car, it’s a limitation on the road.

Light is a car and the road is space. Gravity makes space curved, and light just follows the track.