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Scientists Spot Evidence of Two Huge Companion Stars that Blew Up

The linked remnants may let astronomers measure the time between two supernovae and test binary star evolution models, researchers said.

  • Stanford University researchers reported the first detection of a binary supernova pair on July 21, linking IC 443, also known as the Jellyfish Nebula, and the previously hidden G189.6+3.3 as remnants from gravitationally bound stars.
  • Most massive stars evolve in binary systems, where one star's initial supernova explosion often propels its companion across space; the Jellyfish Nebula's intense brightness long masked the older, fainter G189.6+3.3 remnant nearby.
  • Lead author Miltiadis Michailidis and his team analyzed 16 years of data from the Fermi Gamma-ray Space Telescope, confirming both remnants collide with the same interstellar gas cloud and placing them at comparable distances from Earth.
  • These findings allow astrophysicists to refine theoretical models of massive binary star evolution and death, enabling researchers to calculate energy propagation and explosion timing with unprecedented precision.
  • The team plans to search for other binary supernova remnants across the Milky Way, with future discoveries expected to refine theoretical models of how these complex systems arise and evolve throughout the universe.
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(Seoul = Yonhap News) Reporter Lee Joo-young = The 'Jellyfish Nebula' (IC 443), one of the most famous supernova remnants in the Milky Way, is actually...

·Seoul, Korea (the Republic of)
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Astronomers have for a long time run out of chance, but now a research team finds out: The luminous gas clouds of two former partner stars prove their successive explosion. They were once part of a single system.

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Scientific American broke the news on Tuesday, July 21, 2026.
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