参考文献1. Freedman， W. L.， et al. (1994). “Distance to the Virgo cluster galaxy M100 from Hubble Space Telescope observations of Cepheids.” Nature， 371， 757-762.2. Chaboyer， B.， et al. (1996). “The Age of Globular Clusters in Light of Hipparcos： Resolving the Age Problem?” The Astrophysical Journal， 459， 558.3. Trimble， V. (1996). “H₀： The Incredible Shrinking Constant， 1925-1975.” Publications of the Astronomical Society of the Pacific， 108， 1073-1082.4. Krauss， L. M.， & Chaboyer， B. (2003). “Age Estimates of Globular Clusters in the Milky Way： Constraints on Cosmology.” Science， 299， 65-69.Carroll， S. M. (2003). Spacetime and Geometry： An Introduction to General Relativity. Addison Wesley， Chapter 8.

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