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==Schwarzschild solution and black holes==
{{main|Schwarzschild metric}}
In [[Albert Einstein|Einstein]]'s theory of [[general relativity]], the '''Schwarzschild metric''' (also '''Schwarzschild vacuum''' or '''Schwarzschild solution'''), is a solution to the [[Einstein field equations]] which describes the [[gravitational field]] outside a spherical mass, on the assumption that the [[electric charge]] of the mass, the [[angular momentum]] of the mass, and the universal [[cosmological constant]] are all zero. The solution is a useful approximation for describing slowly rotating astronomical objects such as many [[star]]s and [[planet]]s, including Earth and the Sun. The solution is named after [[Karl Schwarzschild]], who first published the solution in 1916, just before his death.
According to [[Birkhoff's theorem (relativity)|Birkhoff's theorem]], the Schwarzschild metric is the most general [[rotational symmetry|spherically symmetric]], [[Vacuum solution (general relativity)|vacuum solution]] of the [[Einstein field equations]]. A '''Schwarzschild black hole''' or '''static black hole''' is a [[black hole]] that has no [[Charge (physics)|charge]] or [[angular momentum]]. A Schwarzschild black hole is described by the Schwarzschild metric, and cannot be distinguished from any other Schwarzschild black hole except by its mass.
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