Another quantity named for this man can be found by setting the escape velocity to the speed of light.
This man is sometimes the second namesake of an approximation used in one-dimensional radiative transfer problems that says the forward and backward hemispheres have isotropic radiation intensity; that is named for Schuster and him and is also called the two-flux approximation. This man names a criterion which tells whether a star is stable against convection. The extra time that a signal travels due to the Shapiro delay is proportional to a quantity named for this man. A construct named for this man is guaranteed to be a unique exterior solution thanks to (*) Birkhoff's theorem; that construct sets the cosmological constant equal to zero and is characterized by an event horizon and describes a black hole with no charge or angular momentum. Another quantity named for this man can be found by setting the escape velocity to the speed of light. For 10 points, name this German astrophysicist who names a quantity equal to 2 times G times M over c-squared, which is the size at which matter has to be compressed in order to form a black hole.
This man is sometimes the second namesake of an approximation used in one-dimensional radiative transfer problems that says the forward and backward hemispheres have isotropic radiation intensity; that is named for Schuster and him and is also called the two-flux approximation.
Karl Schwarzschild