Astronomers may have just found a first-of-its-kind phenomenon buried in the shadow of one of the Milky Way's most famous stellar explosions: two stars that died in separate supernovas, after spending millions of years orbiting each other.

Using 16 years of data from NASA's Fermi Gamma-ray Space Telescope, researchers detected high-energy gamma rays coming from a faint, previously overlooked supernova remnant called G189.6+3.3, which sits right beside the well-studied remnant IC 443 (nicknamed the Jellyfish Nebula). Their analysis suggests that the two remnants aren't just neighbors by coincidence. Instead, they may be the leftover wreckage of a binary star system, making this the first confirmed case of two supernova remnants traced to the same stellar pair.