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This is one of the most mysterious and interesting part of our universe - The Black Hole What is a Black Hole?[excited] A Black Hole is a region of space where gravity is so strong that nothing can escape, not even light. It forms when a very massive star collapses under its own gravity. The gravitational pull becomes extremely strong because the mass is compressed into a very small region. Structure of a Black Hole Number one, Event Horizon- The Event Horizon is the boundary around a black