Video A video introduction to dark energy, narrated by StarDate's Sandy Wood - Play video |
GlossaryDark matter A form of matter that emits no detectable energy, but that reveals its presence by exerting a gravitational pull on the visible matter around it, such as stars and galaxies. Dark matter appears to make up more than 80 percent of all the matter in the universe. The leading hypothesis says that it consists of a new type of elementary particles, usually described as "wimps" -- weakly interacting massive particles. |
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Copyright ©2008-2013 McDonald Observatory. HETDEX is a collaboration of The University of Texas at Austin, Pennsylvania State University, Texas A&M University, Universitats-Sternwärte Munich, Leibniz Institute for Astrophysics (AIP), Max-Planck-Institut fuer Extraterrestrische Physik, Institut für Astrophysik Göttingen, and University of Oxford. Financial support is provided by the State of Texas, the United States Air Force, the National Science Foundation and the generous contributions of many private foundations and individuals.
