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You have arrived at an archival site.

The Universe Forum's role as part of NASA's Education Support Network concluded in September, 2009. Please visit NASA at http://nasascience.nasa.gov/ for current information about NASA's science, education, and public outreach activities.

Something must be driving the acceleration of the universe.
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- The search for clues is focusing on three leading possibilities.
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- This is the kind of challenge that drives revolutions in science.
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