What Is the Penrose Process

What is the Penrose process?

A) Objects grazing the ergoregion can gain energy from the black hole upon departing this region.
B) Production of virtual pair particles at the event horizon can change the mass and charge of the black hole.
C) Tidal forces can make the density of an object approach infinite values.
D) Two satellites are placed in orbits in opposite directions to measure angular momentum.

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