What feature distinguishes a black hole from all other objects in the universe?
A) It emits large quantities of X-rays.
B) The escape velocity from this object is greater than the speed of light.
C) The shape of its gravitational field is always different from that of an ordinary massive object,even at large distances from it.
D) Its total mass exceeds 3 solar masses.

Question

Quizplus · Accepted Answer

The feature that distinguishes a black hole from all other objects in the universe is that the escape velocity from this object is greater than the speed of light. No object, including light itself, can escape the gravitational pull of a black hole, making it an object of extreme gravity. This also means that any X-rays emitted from the black hole would be trapped within its event horizon, unable to escape. The shape of the gravitational field of a black hole is not always different from an ordinary massive object, and there is no specific mass threshold for a black hole (although it is generally believed to be at least three times the mass of the sun for stellar black holes). Therefore, options A, C, and D are incorrect.

What Feature Distinguishes a Black Hole from All Other Objects