An astronomer has been observing two cepheid variable stars over the course of a month. both variable stars have the exact same period of pulsation. star a is twice as bright as star b. which of the following statements most accurately reflects the relationship between the astronomer (on earth) and both cepheid variable stars? stars a and b have the same luminosity, but star a is closer to earth than star b. stars a and b have the same luminosity, but star b is closer to earth than star a. stars a and b are both the same distance from earth, but the luminosity of star a is greater than star b