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ergosphere
This term is used exclusively within the specialized register of general relativity and astrophysics. It describes a theoretical region of spacetime where the rotation of a massive object, such as a Kerr black hole, forces all nearby particles and light to rotate in the same direction as the hole itself.
Because it describes a specific geometric region of a black hole, it is treated as a countable noun in theoretical physics when discussing multiple black holes or different types of rotating singularities.
Meanings
Examples
The ergosphere is the region where spacetime is dragged by the black hole rotation.
Can an object actually extract energy from the ergosphere via the Penrose process?
Once you enter the ergosphere, you cannot remain stationary regardless of your engine power.
The ship drifted dangerously close to the outer boundary of the ergosphere.
I wonder if we could use the ergosphere to slingshot ourselves across the galaxy.
The professor explained that the ergosphere exists only for rotating black holes.
Light itself is forced to rotate as it passes through the ergosphere.
We must calculate the exact radius of the ergosphere before attempting the jump.