Scientists figure out why black holes burp gas and dust

UPDATE - follow-up to 'Very messy eaters': scientists solve the mystery of when black holes 'burp' - The Guardian: Researchers have figured out the exact reason why black holes throw out gas and dust into space in what looks like a burp. Scientists found that these cosmic objects are very messy eaters, and they shoot out material when they take in too much food at once. This new rule applies to black holes of all sizes, from normal stellar black holes up to giant supermassive ones. The team discovered that all of them follow this same jet-launching rule when they feed.