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A physics professor at Vanderbilt University, embarrassed that 96 percent of the matter and energy in the universe is completely unknown, suggested that both dark matter, which was postulated in an attempt to explain why the universe holds together, and dark energy, which was posited to explain why the universe continues to expand, are really two sides of the same unknown force, which he calls kinetic-energy-driven quintessence, or k-essence.

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A physics professor at Vanderbilt University, embarrassed that 96 percent of the matter and energy in the universe is completely unknown, suggested that both dark matter, which was postulated in an attempt to explain why the universe holds together, and dark energy, which was posited to explain why the universe continues to expand, are really two sides of the same unknown force, which he calls kinetic-energy-driven quintessence, or k-essence.

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