When a Gas Is So Dense That Most of Its

Q7: Giant and supergiant stars are rare because

Q8: When the Sun moves off the main

Q9: Explain how one of the four laws

Q10: Briefly explain why there is a main

Q11: Astronomers determine the internal structure of a

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