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Date: 2006-10-03 18:00:00Galactic astronomy Astrophysics Astrometry Physical cosmology Physical quantities Cosmic distance ladder Milky Way Star Edwin Hubble Astronomy Physics Space | 168 ASTRONOMY: E. HUBBLE PRoc. N. A. S.Add to Reading ListSource URL: www.astrosurf.comDownload Document from Source WebsiteFile Size: 552,74 KBShare Document on Facebook |