What Is the Universe Made Of?

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Science  01 Jul 2005:
Vol. 309, Issue 5731, pp. 78
DOI: 10.1126/science.309.5731.78a

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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.