Astronomers detect radio signal from dying white dwarf explosion.

Astronomers have detected a radio signal from a Type Ia supernova, which is believed to have been caused by a white dwarf star that had stripped helium gas from a companion star, pushing it over the mass limit and causing a thermonuclear detonation. This finding challenges the long-held belief that Type Ia supernovae are caused by the merger of two white dwarfs. The discovery was made using an array of radio telescopes in the UK, and could provide new insights into the consistency of Type Ia supernovae and the role of companion stars in their formation.