Assertion: black hole's gravity | /r/CreatedBy | matter
Facets:
Source sentences:
text: Gravity of this strength may be produced by matter which has been squeezed into a very tiny space.
text: The way it's happening is the energy field created by the gravity of the black hole and that gravity is created by the matter it's eaten throughout its life.
text: They took a 2D black hole and separately considered its two elements: the matter inside it, and the gravity produced by that matter.