Question

what is black hole??

Answer 1

black hole is a place where gravity is very high, light also doesn't escape from black hole, we cannot see the black hole because light doesn't escape from black hole, any till now didn't see the black hole, it us formed when a star is died

Answer 2

When a star dies, then a black hole is formed. It has a very high gravitational force and light too cannot escape. The nearest black hole to us is about 9 billion light years.