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The General Theory of Relativity

The Event Horizon

Space-Time

  • The escape velocity at the event horizon in a black hole = speed of light.
  • An object would need a speed faster than light to get out of the black hole. This is impossible.
  • It is a few kilometres across.

The Schwarzschild Radius

  • An accretion disk is a rotating disk of matter around a massive body under the influence of gravity.
  • Black holes can be detected by the radiation that is emitted and the behaviour of matter near it. This radiation is in the form of X-rays.
  • Named after astronomer, Karl Schwarzschild, who calculated this solution for the theory of general relativity.
  • The Sun has a Schwarzschild radius of 3 km and the Earth's is 9 mm.

What happes if a star approaches a black hole?

Nuclear Fusion in the core of a star

What is the biggest black hole that has ever been detected?

S5 0014+81

The solar system. Huge, eh?

The Star Cycle

Black holes

  • A mysteryious object where nothing can escape. Not even light.
  • A singularity with immense density and gravity.
  • Where does it lead to? Why do they exist? Why are they invisible?

Black Holes and the Schwarzschild radius

AISHWARYA SRINIVAS

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