Stars can turn into black holes without a supernova

As a rule, astronomers believe that stars have to explode in a supernova before they collapse into black holes. That violent death is always the cue, right? Not necessarily. Researchers have spotted a massive star 22 million light years away, N69...

from Engadget RSS Feed https://www.engadget.com/2017/05/28/stars-become-black-holes-without-supernova/