Astronomy Cast Ep. 11: A Universe of Dark Energy

http://www.astronomycast.com/archive/

From November 20, 2006.

The discovery of dark energy was one of the biggest surprises in astronomy. Instead of a nice, predictable expanding Universe, acted on only by gravity, astronomers turned up a mysterious repulsive force accelerating the expansion of the Universe. Fraser and Pamela explain the evidence for a dark energy, and a few possible theories for what could be providing this repulsive force.

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