Black Holes
A black hole is a region of spacetime where gravity is so strong that nothing, no particles or even electromagnetic radiation such as light, can escape from it.
About this fact
Black holes are formed from the gravitational collapse of massive stars at the end of their life cycle. When a star with a mass several times that of our Sun runs out of nuclear fuel, its core collapses under its own gravity, leading to a supernova explosion. If the remaining core is dense enough, it continues to collapse into an infinitely small point called a singularity, surrounded by an event horizon, the boundary beyond which nothing can escape. There are different types of black holes, including stellar black holes, supermassive black holes found at the center of galaxies, and theoretical primordial black holes.