Exploding Stars Point to a Universal Repulsive Force

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Science  30 Jan 1998:
Vol. 279, Issue 5351, pp. 651-652
DOI: 10.1126/science.279.5351.651

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Studies of distant, exploding stars called supernovae are suggesting that the universe could be permeated by a large-scale repulsive force. The reservoir of energy fueling that force could be anything from a quantum-mechanical shimmer in empty space, called the cosmological constant, to even more exotic possibilities that go by names like X-matter and quintessence.