Related video: Visualisation of two dwarf stars locked together in a dance of mutual gravitation
Scientists have identified a "greedy" white dwarf star, V Sagittae, which is “going thermonuclear” as it rapidly devours its twin star.
The double star system, located 10,000 light-years from Earth, orbits every 12.3 hours, with the white dwarf's intense feeding causing it to burn unusually bright.
Professor Phil Charles explained that V Sagittae's extreme brightness, a mystery since its 1902 discovery, is due to the white dwarf "sucking the life out of its companion star."
Dr Pasi Hakala's team discovered a giant ring of gas around the stars, formed because the white dwarf cannot consume all the mass transferred from its twin.
Astronomers predict that the system's frantic lurching indicates an imminent, violent end, with a potential supernova explosion so bright it would be visible from Earth even in daylight.