The Age of a Star Cluster Can Be Approximated by Finding

Q13: The period-luminosity relation for Cepheid and RR

Q14: Observing star clusters will give astronomers needed

Q15: List the two basic types of intrinsic

Q16: As a one-solar-mass star evolves off the

Q17: Cepheid variable stars are classified as either

Q19: Why is there an upper end in

Q20: There is a mass-luminosity relationship because stars

Q21: Cepheid and RR Lyrae variable stars change

Q22: Variables of a certain type are called

Q23: Explain how the age of a star