Astronomers have observed the first visual evidence of a double-detonation in a supernova remnant, offering crucial insights into Type Ia supernovae.
Located in the Large Magellanic Cloud, SNR 0509-67.5 revealed two concentric calcium shells, indicating two explosive events. This supports the double-detonation model, where a white dwarf experiences two detonations.
The study, published in Nature Astronomy on July 2, 2025, enhances our understanding of stellar explosions and their role in measuring cosmic distances.