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radius British & World English

A straight line from the centre to the circumference of a circle or sphere

radius vector British & World English

A line of variable length drawn from a fixed origin to a curve

radius of curvature British & World English

The radius of a circle which touches a curve at a given point and has the same tangent and curvature at that point

Schwarzschild black hole British & World English

A black hole of a kind supposed to result from the complete gravitational collapse of an electrically neutral and non-rotating body, having a physical singularity at the centre to which infalling matter inevitably proceeds and at which the curvature of space-time is infinite. A Schwarzschild radius is the radius of the boundary of a hole of this type

Schwarzschild radius in Schwarzschild black hole British & World English

A black hole of a kind supposed to result from the complete gravitational collapse of an electrically neutral and non-rotating body, having a physical singularity at the centre to which infalling matter inevitably proceeds and at which the curvature of space-time is infinite. A Schwarzschild radius is the radius of the boundary of a hole of this type


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