A star exploded twice — First-ever image reveals its cosmic fingerprint

Astronomers studying the remnant SNR 0509-67.5 have finally caught a white dwarf in the act of a rare “double-detonation” supernova, where an initial helium blast on the star’s surface triggers a second, core-shattering explosion.

from Latest Science News -- ScienceDaily https://ift.tt/bUADC4g