Question

What is a black hole?

Answer 1

A black hole is just a celestial body having extremely high density. It no some hole, but just made up of mass just like planets and stars. Due to its high density, a black hole's gravitational field is very strong. Even light falling on it cant escape out. To imagine its density, imagine all the mass on the earth crushed into a small sphere of diameter of about 9mm

Answer 2

A black hole is just a celestial body having extremely high density.