New observations of a rocky exoplanet called YZ Ceti b have provided evidence of its own magnetic field, which could help scientists understand the magnetic fields of planets in our own solar system. While Earth has a magnetic field, Venus does not, highlighting the mysteries surrounding the formation of magnetism. Detecting exoplanet magnetic fields has been challenging due to their faintness, but recent observations of YZ Ceti b suggest the presence of a magnetic field. Understanding the prevalence and formation of exoplanet magnetic fields is crucial for scientists to gain insights into the magnetism of other worlds.
https://www.quantamagazine.org/exoplanets-could-help-us-learn-how-planets-make-magnetism-20230807/