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Date: 2009-07-22 13:05:55Local Group Spiral galaxies Light-year Speed of light Moon Andromeda Galaxy Milky Way Solar System Sun Astronomy Space Light | Activity: Space Travel background: In the “From Earth to the Universe” exhibit, distances from Earth to astronomical objects are given in light-seconds, light-minutes or light-years. A light-second is the distance liAdd to Reading ListSource URL: xrtpub.harvard.eduDownload Document from Source WebsiteFile Size: 3,87 MBShare Document on Facebook |