Assertion: black hole's event horizon | /r/HasProperty | spherical
Facets:
value: with a radius
type: OTHER
Source sentences:
text: Each bell also has a somewhat unique shape, whereas black holes are all infinitesimal, dimensionless points in space surrounded by spherical event horizons.
text: For a non-rotating black hole, the event horizon is a spherical surface, with a radius equal to the Schwarzschild radius, centered on the singularity at the black hole's heart.