Assertion: black hole's event horizon | /r/HasProperty | name
Facets:
Source sentences:
text: In short, the Event Horizon of a black hole is a name we give to the region of spacetime beyond which anything that drops into it can never come back out.
text: Event horizon is the name given to r s , because from that radius the escape velocity from the black hole's gravity is the speed of light.
text: The limit of this region is called the event horizon, a name which signifies that it is impossible to observe any event taking place inside it (since information is unable to get out).