Assertion: black hole's event horizon | /r/CapableOf | outshine entire galaxies
Facets:
Source sentences:
text: Only large black holes are long-lived enough to have cosmic effects—to swallow millions of suns’ worth of mass, to squeeze sufficient energy from the matter approaching their event horizons to outshine entire galaxies, to organize the orbits of billions of stars into well-defined galaxies, and so forth.