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Probing Question: What is dark energy and how do we know it's there? "Dark energy," said Donald Schneider, professor of astronomy at Penn State, "appears to be the major component of the universe." It's not the same thing as dark matter: ordinary planets, rocks, dust, and particles that do not emit light and therefore cannot be easily detected. It's something fundamentally different, outside our current understanding of physics -- a substance totally new to science.
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