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Originally published in Science Express on 4 May 2006
Science 26 May 2006:
Vol. 312. no. 5777, pp. 1148 - 1149
DOI: 10.1126/science.1128570
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Perspectives

ASTRONOMY:
The Vacuum Energy Crisis

Alexander Vilenkin

Even empty space has energy, but understanding its magnitude is a major puzzle. A cyclic series of big bangs has been proposed as a solution; anthropic selection offers another explanation

The author is in the Department of Physics and Astronomy, Tufts University, Medford, MA, 02155, USA. E-mail: vilenkin{at}cosmos.phy.tufts.edu

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