Supermassive black hole’s mysterious hiccups' likely caused by neighboring black hole's 'punches'
A black hole may be punching through the disk of gas and dust surrounding a supermassive black hole, causing its giant neighbor to "hiccup."
TroibNews 
A black hole may be punching through the disk of gas and dust surrounding a supermassive black hole, causing its giant neighbor to "hiccup."
