Black Hole – UPSC Prelims

What is a Black Hole?
  • Black hole refers to the remains of a supergiant star that has collapsed into itself.
  • It is so dense and has a gravitational field so intense, that light itself cannot escape from it.
  • Formation of Black Hole: When stars much more massive than the Sun reach the end of their lives, they collapse under their own gravity, and the product of this collapse, most astronomers believe is a black hole.
  • Parts of Black Hole: A black hole has two parts:
    • Singularity: At the core of a black hole is a singularity. It is a point that is infinitely dense, as all the remnant mass of the star is compressed into this point.
    • Event horizon: It is an imaginary surface surrounding the singularity, and the gravity of the object is such that once anything enters this surface, it is trapped forever. Not even light can escape the pull of the singularity once it crosses the event horizon.

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