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        6-12

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        Auditory, Visual

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        Stream Only


        Part of NOVA
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        Gravity and the Expanding Universe

        Recent research has found that the universe is not only expanding, but that the rate of expansion is accelerating. To explain this acceleration, scientists have come to believe that there may be a repulsive force caused by "dark energy," an idea first developed by Albert Einstein. In this video segment adapted from NOVA, learn about the history of our understanding of the expansion of the universe.

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