TNRTB Archive - Retained for reference information
In studies of young open star clusters astronomers note that the younger the cluster the bluer and more variable are the medium and small-sized stars. They determined that the blue enhancement and variability are due to large star spots and rapid rotation. The bottom line is that life is impossible on planets orbiting stars younger than a half billion years.
John R. Stauffer, et al, “Why Are the K Dwarfs in the Pleiades So Blue?” Astronomical Journal, 126 (2003), pp. 833-847.
RTB article: Facts for Faith article on the Faint Sun Paradox
RTB video: Journey Toward Creation, 2nd edition
RTB book: The Creator and the Cosmos, third edition