Question

What is scientific definition of black hole?

Answer 1

A gravitationally domineering celestial body with an event horizon from which even light cannot escape; the most dense material in the universe, condensed into a singularity, usually formed by a collapsing massive star.

Answer 2

A black hole is a region of space from which nothing, not even light can escape or we can say these are formed when the gravitational pull of star exceeds to such a high limit that not even light can escape from it.

Hope this helps