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Figure 7
Figure 7: Positions of Cepheid variables in HST/ACS observations of the galaxy NGC 4258. Typical Cepheid lightcurves are shown on the top. Image reproduced with permission from [129]; copyright by AAS.

Neal Jackson, "The Hubble Constant",
Living Rev. Relativity, 18 (2015), 2, doi:10.1007/lrr-2015-2, URL (accessed <date>): http://www.livingreviews.org/lrr-2015-2.
© The author(s), except where otherwise noted. This work is licensed under a Creative Commons Attribution 4.0 International License.