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gravitational radius
subjectfact 
gravitational radiushas definition The radius which an object should have in order that light emitted from its surface just ceases to escape from its surface.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:33:26.0
is an instance of radius2001-09-27 09:33:26.0
lengthhas unit length unit2001-09-27 09:33:26.0
numberhas value2001-09-27 09:32:57.0