Core Viewpoint - The research team from Peking University has detected a new type of millisecond radio burst originating from the magnetic field of stellar sunspot regions using the "China Sky Eye" (FAST), filling a gap in understanding small-scale magnetic fields of exoplanetary stars and significantly contributing to the study of space weather beyond the solar system [1][2]. Group 1 - The solar magnetic field drives solar activity, which typically originates from localized strong magnetic field regions such as sunspots [1]. - Similar magnetic activity phenomena exist on other late-type stars, with some stars (like active M-type stars) exhibiting more intense and frequent magnetic activities than the Sun, significantly affecting the habitability of nearby planets [1]. - Traditional methods for measuring stellar magnetic fields have primarily provided large-scale global magnetic field information, lacking the ability to discern small-scale magnetic structures in stellar sunspot regions [1]. Group 2 - The high sensitivity radio observations from "China Sky Eye" offer a new complementary approach to optical methods for detecting and studying sunspots [1]. - By detecting radio signals emitted from the localized magnetic field structures above stellar sunspots, the research team can constrain the size of the sunspots and understand the strength and structure of the coronal magnetic field above them, accurately characterizing the properties of stellar sunspots [1]. - The research team is also utilizing FAST to explore young solar-type stars, brown dwarfs, and stellar-planet interaction processes, which will further expand understanding of stellar magnetic activities and their driven exoplanetary space weather phenomena, providing important insights for the search for habitable exoplanets [2].