Black holes are parts of space that have gravitational fields so intense that they suck in everything, including radiation.
Those deemed to be "supermassive" are millions to billions times the mass of our sun.
And now, researchers at Australian National University believe they've located the fastest-growing one of them all.
"This black hole is growing so rapidly that it's shining thousands of times more brightly than an entire galaxy, due to all of the gases it sucks in daily that cause lots of friction and heat," ANU astronomer Christian Wolf says on the university's website.
It was discovered with the help of the SkyMapper telescope.
"If we had this monster sitting at the centre of our Milky Way galaxy, it would appear 10 times brighter than a full moon," Wolf notes. "It would appear as an incredibly bright pin-point star that would almost wash out all of the stars in the sky."