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Date: 2013-07-25 14:16:04Standard candles Supernova remnant G1.9+0.3 Space Supernova remnant Supernova Cosmic distance ladder Dave Green Astronomy Supernovae Astrophysics | Chandra Science HighlightsAdd to Reading ListSource URL: chandra.harvard.eduDownload Document from Source WebsiteFile Size: 109,32 KBShare Document on Facebook |