Assertion: black hole's property | /r/HasProperty | its mass and angular momentum
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Source sentences:
text: These known solutions include the Schwarzschild solution, which describes space-time with a nonrotating black hole, and the Kerr family of solutions, which describe configurations of space-time empty of everything save a single rotating black hole (where the properties of that rotating black hole—its mass and angular momentum—vary within the family of solutions).