For what type of object is the period-luminosity relation used for determining distances?

For what type of object is the period-luminosity relation used for determining distances?


a. RR Lyrae variables


b. Cepheids


c. Eclipsing binaries


d. 21 centimeter radiation|||Cepheids:


http://www.daviddarling.info/encyclopedi鈥?/a>





--Bill Pardue


Arlington Heights Memorial Library http://www.ahml.info


Librarians--Ask Us, We Answer!


Find your public library at http://www.publiclibraries.com|||(B)