The Sun’s nearest stellar neighbor, Proxima Centauri, has a regular cycle of starspots, according to a team of astronomers from the Harvard-Smithsonian Center for Astrophysics (CfA) and the Astronomical Observatory at the University of Warsaw. Proxima Centauri. Image credit: Hubble / ESA / NASA. Our Sun experiences an 11-year activity cycle. At the solar minimum, the star is nearly spot-free. At solar maximum, typically more than 100 sunspots cover...
