Physicists and astronomers study the ways in which various forms of matter and energy interact. Theoretical physicists and astronomers may study the nature of time or the origin of the universe. Some physicists design and perform experiments with sophisticated equipment such as particle accelerators, electron microscopes, and lasers.
In 1967, John Wheeler coined the term ‘black hole’. Black holes are the residue that is left when hyper or giant stars die. Once the stars end their life cycle and burn out the entire fuel needed for sustaining its shape and operation, the stars implode into the center and pull out abundant mass into a single point in space.
Black hole is the region of space which has an extremely intense gravitational field- so intense that no radiation or matter can escape from it. Not even the particles of light can escape from inside it.