Ergosphere

The ergosphere is the area immediately outside the event horizon of a spinning black hole (also known as a Kerr black hole), where an observer is compelled to rotate along with the black hole and is unable to remain stationary with respect to the rest of the universe.

  • The static limit is the ergosphere's outer boundary. Event horizon and stationary limit meet in a Schwarzschild black hole that is not rotating.
  • The Penrose process, which allows energy to be extracted from the black hole in this area, gave rise to the name "ergosphere" (the prefix "ergo" implies ....
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