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Date: 2014-10-06 11:21:13Cepheid variables Standard candles Spiral galaxies Local Group Henrietta Swan Leavitt RS Puppis Variable star Cosmic distance ladder Andromeda Galaxy Astronomy Space Astrometry | Cepheid Variable Star RS Puppis National Aeronautics and Space AdministrationAdd to Reading ListSource URL: amazing-space.stsci.eduDownload Document from Source WebsiteFile Size: 3,67 MBShare Document on Facebook |