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Pictures courtesy David Spergel Ellen Zweibel, Scott Tremaine, and Neil Tyson Arthur Davidsen and Kathryn Johnston Ue-Li Pen, Masataka Fukugita, and Russell Kulsrud Rich Gott, Jeremy Goodman, and Douglas Richstone Myrna Jenkins, Ed Jenkins, and Jerry Ostriker Larry Smarr and Jerry Ostriker Gabriel Ostriker and Dick McCray Rebecca Ostriker, Scott Tremaine, John Bahcall, James Binney, and Eve Ostriker |