A strange radio signal pulsing from a spot 15,000 light-years away could point to an unconfirmed type of star.
Astronomers have just found a second example of a white dwarf acting as a pulsar, following the first discovery in 2016.
Scientists identified the cause of the unusual single-sided pulsation of the star named HD 74423. It is located in a binary star system with a red dwarf - its close companion distorts the oscillations with its gravitational pull.
