Ergosphere is a region outside rotating black holes (Kerr black holes) outer event horizon. The event horizon marks the boundary between the black hole and the rest of the universe.
- A black hole is formed when a really massive star runs out of fuel to fuse, blows up, leaving its core to implode under its weight to form a black hole.
- The centre of a black hole is a gravitational singularity, a point where the general theory of relativity breaks down. Albert Einstein’s theory of special relativity tells us that no signal can exceed the speed of light in a vacuum A black hole’s great gravitational pull emerges as if from the singularity.
- The event horizon describes a sphere around the singularity: when anything enters this sphere, it can’t escape unless it travels faster than light (which is impossible). Just beyond this sphere, a rotating black hole will also have an ergosphere.
- Ergosphere is a bigger sphere that an object can enter and then leave if it’s moving fast enough, but still less than the speed of light.
- It is so named because it is possible to extract matter and energy from the ergosphere, but not from beyond the event horizon.
