GRE Reading Comprehension: Manhatton-GRE阅读Manhatton - 81G_946D1CUJ64MOA$

Which of the following is not mentioned in the passage regarding Hubble's experiment in which he deduced Hubble's Law? A. It used years of data on Cepheid variable stars. B. Hubble accumulated data using the Mount Wilson Observatory and help from a fellow astronomer. C. Hubble found that all the observed stars appeared to be moving away from Earth. D. Hubble deduced the distance to Cepheid variable stars based on the rate at which they blinked and flickered. E. Hubble deduced the velocity of Earth to find the stars' absolute velocities. Consider each of the answer choices separately and indicate all that apply.