Black Holes: Internal Structure and Composition

Internal Structure: Unknown except the fact that the gravitational field is so strong that light can't even escape

Composition: Ergosphere, photon sphere, event horizon, singularity

Singularity: the point at which space, time, and the laws of physics cease to exist and has zero volume and infinite density

Event Horizon: the boundary at which escape velocity is the speed of light and nothing can be observed beyond it

Laplace Publications: Théorie analytique des probabilités, Méchanique céleste, Exposition du système du monde