Dead planets orbiting dead stars can give off ghostly radio wave emissions that are detectable from Earth.<br />They allow us to track planets even billions of years after their stars have run out of fuel.<br />Researchers believe we could “tune into” radio waves given off by the cores of exoplanets that orbit around white dwarfs.<br />A core is created when a planet orbits a star which has burned through its fuel and stripes away its outer layers.
