Astronomers have discovered what may be the brightest object in the universe, a quasar with a black hole at its heart growing so fast that it swallows the equivalent of a sun a day. The black hole powering this distant quasar is more than 17 billion times more immense than our sun, an Australian-led team reported Monday in the journal Nature Astronomy. The rotating disk around the quasar's black hole — the luminous swirling gas and other matter from gobbled-up stars — is like a cosmic hurricane.