"Promising Signs of Magnetic Fields on Earth-like Exoplanets Detected through Coherent Radio Signals"
Researchers have detected a repeating radio signal from the star YZ Ceti, indicating that its rocky exoplanet, YZ Ceti b, may have a magnetic field. A planet's magnetic field can protect its atmosphere from being eroded by particles from its star. The radio waves detected are generated by the interactions between the magnetic field of the exoplanet and the star it orbits. The strength of those radio waves can then be measured, allowing researchers to determine how strong the magnetic field of the planet might be.