First exoplanet spotted from stellar aurora

For the first time, astronomers have discovered an exoplanet by looking at how it whips up the magnetic field of its star. Researchers examined the radio emissions from a star called GJ 1151 and found an unusually lengthy solar flare that they say could only be caused by a hidden Earth-size planet. It’s tricky to confirm the finding with other exoplanet-detection methods, but if the technique stands up, it offers a whole new way to find distant worlds.