10th Annual Kaczmarczik Lecture
Thursday, December 1st, 2004 - 3:30 PM
Main Auditorium, Main Building
3141 Chestnut Street
Philadelphia, PA 19104
Michael Turner
University of Chicago and National Science Foundation
The sky is filled with hundreds of billion galaxies, all lit up by their stars. Stars account for less than one percent of the material in the Universe, and galaxies are held together by a new form of matter - dark matter - that accounts for 1/3 of the stuff in the Universe. The other 2/3 exists in an even more mysterious form - dark energy - and is causing the expansion of the Universe to speed up, rather than slow down.
