Stellar black holes

Stellar black holes are dense remnants of massive stars that have undergone a supernova explosion. When a star significantly larger than our sun exhausts its fuel, it collapses under its own gravity, squeezing its core into a point of infinite density called a singularity, surrounded by an event horizon—the point beyond which nothing can escape. These black holes typically have a mass a few times that of the sun and can be detected by their effects on nearby matter, such as matter falling into them and emitting X-rays. They are key objects for understanding extreme physics and the life cycles of stars.