Scientists see black hole's corona disappear, then reappear for 1st time

For the first time, astronomers witnessed the ultrabright corona around a supermassive black hole disappear, fading by a factor of 10,000 in 40 days. Almost immediately, it began reappearing, eventually growing 20 times brighter. Scientists hypothesize that a rogue star might have come too close to the black hole and been torn apart, with its debris briefly dispersing the gas.