WHAT IS BLOCK HOLE

Nothing can escape from the surface of the body is called as"Block hole".It is spherical in shape.

Approved

en.wikipedia.org/wiki/Black_hole

A blackhole is a region of spacetime from which gravity prevents anything, including light, from escaping. The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. Around a black hole there is a mathematically defined surface called an event horizon that marks the point of no return. It is called "black" because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body inthermodynamics.Quantum field theory in curved spacetime predicts that event horizons emit radiation like a black body with a finite temperature. This temperature is inversely proportional to the mass of the black hole, making it difficult to observe this radiation for black holes of stellar mass or greater.

Block hole is an object that exerts a gravitational force on other bodies, but it cannot emit any light of its own.