Astronomers propose novel method of measuring galaxy distances
Our Universe consists of hundreds of billions of galaxies, and for nearby galaxies, distances are mainly measured by classical Cepheids and RR Lyrae (RR Lyr) stars.
RR Lyr stars are pulsating variable stars that are 100 times brighter than our Sun and more than twice as old. They can be used as a standard candle for measuring the distances of galaxies, due to the tight relationship between