To be published in Reviews of Modern Physics Colloquia, 2003.

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Wendy L. Freedman

Observatories of the Carnegie Institution of Washington
813 Santa Barbara St., Pasadena, CA 91101, USA

Michael S. Turner

Center for Cosmological Physics and the Departments of Astronomy & Astrophysics and of Physics,
The University of Chicago, 5640 S. Ellis Ave., Chicago, IL 60637-1433
and NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory,
MS 209, PO Box 500, Batavia, IL 60510-0500

Abstract: Revolutionary advances in both theory and technology have launched cosmology into its most exciting period of discovery yet. Unanticipated components of the universe have been identified, promising ideas for understanding the basic features of the universe are being tested, and deep connections between physics on the smallest scales and on the largest scales are being revealed.

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