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Cosmic Scales Two diagrams using our location in Charlottesville and the US to portray the size of the galaxy, and the size of the visible Universe. Our Galaxy Earth Sun Earth orbit Solar system Nearest star = = = = = 100 nm 10 μm ¼ cm 20 cm 250 m = = = = = virus cell pin head saucer lawn Jewel Box Cluster Naked eye stars Eagle Nebula Galaxy Center Crab Nebula Solar system 13.7 Gly The Visible Universe MW galaxy Local group Virgo cluster Coma cluster = = = = 20 m 600 m 15 km 100 km Keck/VLT + Cluster Lens = = = = 0 class room central grounds Walmart Culpeper SDSS & 2dFGRS “Nearby” galaxies HDF Our Galaxy