Black holes have strong gravity from "summary" of Space Encyclopedia by David A. Aguilar,Christine Pulliam,Patricia Daniels
Black holes are regions in space where gravity is extremely powerful. The gravity in a black hole is so strong that not even light can escape its grasp. This means that anything that gets too close to a black hole, including light, will be pulled in and never able to escape. The strength of a black hole's gravity comes from its immense mass, which is packed into a very small space. As objects get closer to a black hole, the gravitational pull they experience becomes stronger and stronger. This is why black holes are able to trap even the fastest and most energetic particles, like light. The intense gravity of a black hole also has other effects on its surroundings. For example, the strong gravitational pull of a black hole can cause nearby objects, such as stars or planets, to orbit around it in a very tight and fast manner. This is because the black hole's gravity is constantly pulling these objects towards it, bending their paths around the black hole. The strong gravity of a black hole also warps space and time around it. This means that if you were to observe a clock falling into a black hole from a distance, you would see the clock's hands slowing down and eventually coming to a stop as it nears the black hole. This is due to the intense gravitational pull bending time itself.- Black holes have incredibly strong gravity because of their massive mass packed into a small space. This powerful gravity can trap even light, cause objects to orbit tightly around the black hole, and warp space and time around them. The concept of black holes having strong gravity is a fascinating and mind-bending aspect of our universe.
