Assertion: black hole's gravity | /r/CapableOf | become strong
Facets:
Source sentences:
text: Because the size of the star gets smaller but the mass of it does not, the gravity surrounding the star becomes so strong it absorbs everything around it, including light.
text: Einstein’s theory suggested that if gravity could become strong enough, it would rob light of all its energy, trapping it in the same way in which it traps a planet’s atmosphere.