Teardrop star reveals hidden supernova doom

In a rare occurrence, a white dwarf pulls a subdwarf towards its demise.

A big blue circle being pulled into a tear shape by a small blue disc
Artist's impression of the HD265435 system at around 30 million years from now, with the smaller white dwarf distorting the hot subdwarf into a distinct 'teardrop' shape. Credit: University of Warwick/Mark Garlick