Their size can be described using the Schwarzschild radius, and at their center lies a gravitational singularity.
Solutions to the Einstein field equations for these entities are named for Reissner, Nordstrom, and Kerr. Energy and mass can theoretically be extracted from them in their ergospheres, and they are completely characterized by their mass, angular momentum, and charge. These entities are subject to the no-hair theorem, and they are predicted to emit Hawking radiation. Their size can be described using the Schwarzschild radius, and at their center lies a gravitational singularity. For 10 points, name these massive astronomical objects from which light cannot escape.
Solutions to the Einstein field equations for these entities are named for Reissner, Nordstrom, and Kerr.
Black Holes