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A '''gravitational singularity''' (sometimes '''spacetime singularity''') is, approximately, a place where quantities which are used to measure the [[gravitational]] field become [[infinity|infinite]]. Such quantities include the curvature of [[spacetime]] or the density of [[matter]]. More accurately, a [[spacetime]] with a singularity contains geodesics which cannot be completed in a smooth manner. The limit of such a geodesic is the singularity.

A '''singularity''' (sometimes '''spacetime singularity''') is, approximately, a place where quantities which are used to measure the [[gravitational]] field become [[infinity|infinite]]. Such quantities include the curvature of [[spacetime]] or the density of [[matter]]. More accurately, a [[spacetime]] with a singularity contains geodesics which cannot be completed in a smooth manner. The limit of such a geodesic is the singularity.

The two most important types of spacetime singularities are ''curvature singularities'' and ''conical singularities''. Singularities can also be divided according to whether they are covered by an [[event horizon]] or not (naked singularity).  According to [[general relativity]], the initial state of the [[universe]], at the beginning of the [[Big Bang]], was a singularity. Another type of singularity predicted by general relativity is inside a [[black hole]]: any star collapsing beyond a certain point would form a black hole, inside which a singularity (covered by an event horizon) would be formed, as all the matter would flow into a certain point (or a circular line, if the black hole is rotating). These singularities are also known as curvature singularities.

The two most important types of spacetime singularities are ''curvature singularities'' and ''conical singularities''. Singularities can also be divided according to whether they are covered by an [[event horizon]] or not (naked singularity).  According to [[general relativity]], the initial state of the [[universe]], at the beginning of the [[Big Bang]], was a singularity. Another type of singularity predicted by general relativity is inside a [[black hole]]: any star collapsing beyond a certain point would form a black hole, inside which a singularity (covered by an event horizon) would be formed, as all the matter would flow into a certain point (or a circular line, if the black hole is rotating). These singularities are also known as curvature singularities.