Sun has followed same routine for 29 crore yrs, finds study
Germany-based scientists have suggested the sun has been following the same routine for at least 29 crore years. Scientists found the sun underwent a sunspot cycle of approximately 10.6 years during ancient times, quite similar to the 11-year cycle of modern times. A sunspot cycle is a time after which sun's illumination completes one round of increasing and decreasing brightness.