Stunning image of a supernova reveals a dead star that exploded twice
Two concentric rings appear around the supernova remnant SNR 0509-67.5, indicating that it exploded twice ESO/P. Das et al. Background stars (Hubble): K. Noll et al. A white dwarf star around 160,000 light years away appears to have exploded twice – the first evidence astronomers have seen that such supernovae involve a double detonation. White…


