White dwarfs typically have a radius just ... Red giants exist for only a short time—perhaps just a billion years–compared with the ten billion the same star may already have spent burning ...

Learn how gravity and mass are pulling two stars into tighter, faster orbit around each other, with an explosive collision ...

The white dwarf is visible as the magenta dot right ... But on closer inspection, there seemed to be a very subtle short-term variation – a flicker that occurred every three hours.

A white dwarf and a red dwarf orbiting each other every 125 minutes emit radio pulses, confirmed through observations with multiple telescopes. This discovery clarifies the origin of such pulses ...