"This is certainly an outburst unlike any other we've seen in the past 50 years."

This 7-hour cosmic explosion is the longest gamma-ray burst ever seen. Could it be from an elusive class of black hole?

Source: space
Source Link: https://www.space.com/astronomy/black-holes/this-7-hour-cosmic-explosion-is-the-longest-gamma-ray-burst-ever-seen-could-it-be-from-an-elusive-class-of-black-hole