The 900-year-old mystery of the missing supernova has finally been solved

A 900-year-old galactic mystery has been solved! The cold case of The Star That Appeared in the Night But Then Disappeared Without a Trace may finally have found its perp.

The story begins in 1181 CE. On August 6, Chinese and Japanese astronomers saw a "new" star in the sky, what they called a "Guest Star." It brightened over time before fading, getting about as bright as Saturn at its peak. In February 1182 it faded from view, having been visible to the unaided eye for six months.

This sounds...