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Secret groups, police operations and high-tech tests are not normally associated with Christmas cards. Yet these and other facts give this holiday

Black holes eat their way through galaxies by employing a complex repertoire of buffet manners, according to an international team of astronomers led by the University of Pretoria’s Dr Jack Radcliffe.   Dramatically diverse eating preferences drive this cosmic dining decorum: some black holes chew the stellar cud and savour their meals; others stage prolonged hunger strikes that leave them starving. When shredding objects into threads of atoms, smaller black holes just a few times the mass of our Sun spaghettify everything unlucky to get close enough. Supermassive black holes behave as th...

Astronomers Are Homing in on The Colossal Feeding Processes of Huge Black Holes 14 APRIL 2021 The more we study the Universe, the more it seems likely that each galaxy is orbiting a cosmic colossus - a supermassive black hole, powering the galactic nucleus. There's a lot we don't know about these giant objects - including the glaring question of how they grow so huge - but new research could help us fill in some of the gaps. According to a new radio survey of all the galaxies in a region of the sky, every supermassive black hole in a galactic nucleus devours matter, although they go about i...