Pulsating Stars and Cosmic Distances
Because the rate at which a cepheid variable star pulsates is related to its luminosity, it serves as an astronomical yardstick. Corrections in the yardstick have again raised estimates of the age of the universe
Because the rate at which a cepheid variable star pulsates is related to its luminosity, it serves as an astronomical yardstick. Corrections in the yardstick have again raised estimates of the age of the universe