A black hole is a very dense object, for which the escape velocity equals or exceeds the speed of light. Since this would completely destroy the small object, it cannot escape. 2. Stars about the size of our Sun burn out, become red giants, and then evolve into a white dwarf.
More massive stars become luminous giant starts.
When their nuclear energy is exhausted gravity is the only force left. The star collapse inward, and exploding mantles hurl outward, and the star becomes a brief blazing supernova. The star collapses so suddenly and so violently that nothing can stop it. Gravity overwhelms all other forces, and all matter falls deep into the star. The star becomes smaller and smaller, denser and denser.