This ancient supernova occurred around 185 AD; it stands as one of the oldest recorded cosmic explosions ever observed by humanity.
NASA's X-ray missions studied RCW 86 and found evidence that the explosion expanded inside a massive, low-density cavity in space.
That hidden cavity allowed supernova debris to surge outward much faster than scientists typically expect from remnants of this age.
As the 2,000-year-old remnant RCW 86 appeared unusually large, it created a long-standing mystery that has baffled astronomers worldwide for decades.
Researchers now believe that, prior to the explosion, the disintegrating star system formed a massive bubble, thereby giving the remnant its peculiar shape.
New X-ray observations revealed reflected shock waves, showing expanding debris striking the cavity wall and bouncing back.
This reheating reheated the gas within RCW 86, helping astronomers understand why various regions today glow with different X-ray energies.
These studies strongly support the identification of RCW 86 as a Type Ia supernova, formed by an uncontrolled explosion triggered within a white dwarf star.
By unveiling this mysterious structure, NASA helped solve a 2,000-year-old mystery and revealed how stars can shape their violent deaths.
By unveiling this mysterious structure, NASA helped solve a 2,000-year-old mystery and revealed how stars can shape their violent deaths.