Anti-de Sitter space bell. It might be described as being the "opposite" of the surface of a sphere, which has a positive curvature. General relativity is a theory of the nature of time, space and gravity in which gravity is a curvature of space and time that results from the presence of matter or energy. Energy and mass are equivalent (as expressed in the equation "E" = "mc"), and space and time can be translated into equivalent units based on the speed of light ("c" in the "E" = "mc" equation). A common analogy involves the way that a dip in a flat
Kepler's equation are generally required to evaluate . There are several forms of Kepler's equation. Each form is associated with a specific type of orbit. The standard Kepler equation is used for elliptic orbits (0 ≤ "e" < 1). The hyperbolic Kepler equation is used for hyperbolic trajectories ("e" ≫ 1). The radial Kepler equation is used for linear (radial) trajectories ("e" = 1). Barker's equation is used for parabolic trajectories ("e" = 1). When "e" = 0, the orbit is circular. Increasing "e" causes the circle to become elliptical. When "e" = 1, there are three possibilities: A slight increase in