Millions of years in the past, two gigantic stars engaged in a celestial orbit around each other. One of these stars eventually exploded in a supernova, likely propelling its companion across the cosmos. This companion wandered through space for thousands of years before also undergoing a supernova explosion.
This scenario is what astronomers propose for a newly identified pair of stellar remnants. Based on data from NASA’s Fermi Gamma-ray Space Telescope, researchers propose that these two supernova debris clouds originated from a binary star system, where two stars are gravitationally bound and orbit a shared center.
“There are so many striking connections between the two remnants,” stated Miltiadis Michailidis, a postdoctoral fellow at Stanford University’s physics department, in a statement. “They’re likely related, giving us the first known example of a binary system where both stars have undergone supernova explosions.”
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When a star explodes, it emits powerful shock waves that can accelerate charged particles to speeds near that of light, creating cosmic rays. As these cosmic rays collide with nearby gas clouds, they generate gamma rays, which are the most energetic form of light. By detecting these gamma rays, astronomers can track the remnants of ancient supernovae long after the original stars have disappeared.
This multiwavelength scene shows the Jellyfish Nebula supernova remnant (right), the interstellar cloud it’s interacting with and a distinctive curving filament to its upper left.
NASA Goddard Space Flight Center/M. Michailidis et al. 2026; DSS (optical); NASA/WISE/JPL-Caltech/UCLA (infrared); NASA/Swift (ultraviolet)
Over 16 years of observations with the Fermi telescope, researchers studied two remnants in the Gemini constellation: the renowned Jellyfish Nebula (IC 443) and a fainter counterpart known as G189.6+3.3. Both seem to interact with the same dense gas clouds. Computer models backed up these observations, and estimates suggest the objects are roughly equidistant from Earth, indicating they might share not only a location but also a common origin.
The researchers calculated that the probability of this alignment occurring by chance is 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 this interaction between the Jellyfish Nebula and G189.6+3.3 is confirmed, it offers a unique opportunity to study the life cycle of massive binary stars. This discovery could also enhance our understanding of the origins of some of the universe’s most energetic particles.
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