Fermi maps two remnants tied to binary supernova

two remnants – Using 16 years of observations from NASA’s Fermi Gamma-ray Space Telescope, researchers say the well-known Jellyfish Nebula (IC 443) and a fainter neighbor, G189.6+3.3, bear the fingerprints of having been part of the same binary star system—potentially the fi

By the time the stars that made it were gone, the evidence was still radiating across space. Now astronomers studying gamma rays say they’ve found two supernova leftovers in the constellation Gemini that appear to share more than just a neighborhood—possibly a common origin.

The larger remnant is the Jellyfish Nebula, also cataloged as IC 443. Next to it sits a much fainter companion, G189.6+3.3. In observations using NASA’s Fermi Gamma-ray Space Telescope. researchers say both are interacting with the same dense gas clouds. a relationship that. taken together with other measurements. points to a binary system where two massive stars evolved and died in succession.

“There are so many striking connections between the two remnants. ” said Miltiadis Michailidis. a postdoctoral fellow at the physics department at Stanford University. in a statement. “They’re likely related. giving us the first known example of a binary system where both stars have undergone supernova explosions.”.

The story starts with the kind of physics that can leave traces long after the fireworks fade. When a star explodes, it expels powerful shock waves that can accelerate charged particles to near-light speeds, creating cosmic rays. Those cosmic rays. in turn. can slam into nearby clouds of gas and produce gamma rays—the highest-energy form of light. By detecting those gamma rays, astronomers can trace lingering remnants of ancient supernovae long after the original stars have vanished.

In this case, the team used 16 years of Fermi observations to examine the two remnants in Gemini. Both appear to be interacting with the same dense gas clouds. and computer simulations further affirmed what the telescope hinted at. The researchers also calculated that the two objects are placed at roughly the same distance from Earth. With those distance estimates aligned. the data suggest the pair share not only a nearby location but potentially a shared beginning.

Their statistical test adds urgency: the odds of the observed alignment happening by chance are less than 1 percent.

“We can now connect the glowing remains of two massive stars to a powerful pair that evolved together over thousands of years,” said Elizabeth Hays, project scientist for Fermi at NASA’s Goddard Space Flight Center in Greenbelt, Md., in the same statement.

If the connection holds, the Jellyfish Nebula’s interaction with G189.6+3.3 would offer a rare place to study how massive binary stars evolve and die. Such systems don’t just matter for stellar history—they may also help explain the origin of some of the highest-energy particles in the universe.

The multiwavelength view makes the picture feel almost tangible. The scene includes the Jellyfish Nebula supernova remnant interacting with an interstellar cloud. plus a distinctive curving filament to its upper left. The dataset spans NASA’s Fermi gamma-ray measurements along with DSS (optical). NASA/WISE/JPL-Caltech/UCLA (infrared). and NASA/Swift (ultraviolet). alongside processing attributed to NASA Goddard Space Flight Center/M. Michailidis et al. 2026.

For now. the researchers are working with a compelling chain of evidence—shared gas interaction. matching distance estimates. simulation support. and an alignment unlikely to be accidental. The remaining question is whether this “sibling” supernova scenario can be confirmed in full. turning two glowing scraps in the sky into the first clearly linked pair of supernova remnants born from the same binary stars.

Fermi Gamma-ray Space Telescope Jellyfish Nebula IC 443 G189.6+3.3 supernova remnants binary stars cosmic rays gamma rays NASA Goddard astronomy high-energy particles Gemini constellation