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Science 1 July 2005:
Vol. 309. no. 5731, p. 78
DOI: 10.1126/science.309.5731.78a
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What Is the Universe Made Of?

Charles Seife

Independent measurements of a variety of phenomena indicate that matter makes up only about 30% of the stuff in the universe. The rest is a mysterious antigravity force known as dark energy, the nature of which is arguably the murkiest question in physics.

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CosmoPoetics
Richard C Brill
Science Online, 5 Aug 2005 [Full text]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)