Question

What is adolescent Black Hole Theory according to NASA and ISRO?​

Answer 1

What Is a Black Hole?
The Short Answer:
A black hole is an area of such immense gravity that nothing -- not even light -- can escape from it.

Answer 2

Answer:

A Black Hole is an astronomical object with a gravitational pull so strong that nothing, not even light, can escape it. A black hole's "surface", called it's event horizon,defines the boundary where the velocity needed to escape exceeds the speed of light,which is the speed limit of the cosmos.