Black holes have intense gravity, which is one of the key reasons why light waves are unable to escape from them. This gravity is so strong that not even light, which is the fastest thing in the universe, can escape once it gets too close to the black hole's event horizon.
Here's why:
1. Gravity in black holes is incredibly intense due to the massive concentration of mass in a small space. When light gets close to a black hole, the gravitational pull is so strong that it bends the path of light in such a way that it cannot escape.
2. The region around a black hole where even light cannot escape is called the event horizon. Once light crosses this point, it is essentially trapped by the black hole's gravity and cannot get out.
3. Light needs to travel at a speed of about 300,000 kilometers per second to escape a gravitational pull. However, the gravitational pull of a black hole is so strong that light simply cannot reach the necessary speed to break free.
In summary, the intense gravity of black holes prevents light waves from escaping, trapping them within the black hole's grasp once they cross the event horizon.
