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James Bullock, associate professor of physics and astronomy at UC Irvine, discusses the Center for Cosmology, where scientists study how old the universe is, how big it is, and what it is made of. Bullock is a theoretical cosmologist who studies galaxy formation, and he directs the center. Video by Kerrin Piche Serna, University Communications. More: http://today.uci.edu/iframe.php?p=/news/release_detail_iframe.asp?key=1802