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Nature 446, 25 (1 March 2007) | doi:10.1038/446025a; Published online 28 February 2007

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Into the darkness

Volker Springel1

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Cosmologists face some tough challenges as they explore the composition of the Universe.

BOOK REVIEWEDDark Cosmos: In Search of our Universe's Missing Mass and Energy

by Dan Hooper

Smithsonian Institution: 2006. 256 pp. $24.95

Since the discoveries of Copernicus, astronomy has taught us that there is nothing special about the position of Earth in the Universe. The Sun lies in an unpretentious spiral arm of the Milky Way and is just an ordinary star among 100 billion others in our own Galaxy.

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