Astronomers have spotted a pulsating white dwarf star in the binary stellar system SDSS J115219.99+024814.4 (SDSS J1152+0248 for short). An artist’s impression of two white dwarfs. Image credit: Mark Garlick / University of Warwick. White dwarfs are the burnt-out cores of Sun-like stars and are the fate of 97% of the stars in our Milky Way Galaxy. The internal structure and composition of white dwarfs are hidden by their high gravities, which causes...