Monstrous black hole swallows huge part of galaxy and then falls asleep

A study in Nature finds that black holes in the early Universe go through short periods of ultra-fast growth, followed by long periods of dormancy - (Jiarong Gu)

A massive black hole appears to have eaten so much that it fell asleep, scientists have said.

It swallowed so much of the mass from its surrounding galaxy that it has gone dormant, researchers said.