Twin Supernova Remnants Hint at Exploding Stellar Siblings

Using 16 years of Fermi gamma-ray data, astronomers found gamma rays from the faint remnant G189.6+3.3 overlapping the Jellyfish Nebula, supporting a binary-star origin where both exploded and left two interacting remnants about 6,000 light-years away in Gemini; ages range ~8–9k and 20k–110k years, with simulations showing such dual explosions are plausible and possibly linked to PeVatron acceleration.