A star exploded twice — First-ever image reveals its cosmic fingerprint Date: July 3, 2025 Source: ESO Summary: Astronomers studying the remnant SNR 0509-67.5 have finally caught a white dwarf ...

You may only live once, but some stars die twice. Astronomers have now discovered the first visual evidence of such a stellar event, a dead star that underwent a so-called "double-detonation ...

If that layer becomes unstable and ignites, the explosion generates a shockwave that travels around the white dwarf and inward. That triggers a second detonation in the star’s core: the supernova.