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Science 26 November 1999:
Vol. 286. no. 5445, pp. 1689 - 1690
DOI: 10.1126/science.286.5445.1689
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Perspectives

COSMOLOGY:
Cosmic Explosions in an Accelerating Universe

Mario Livio

Measurements of the distance to supernova explosions are providing new insights into fundamental cosmological questions. Recent observations indicate that the universe's expansion is accelerating, contrary to previous assumptions. If confirmed, the results will revive the concept of the cosmological constant, that is, the action of some repulsive force on the largest scales of the universe, and imply that the universe will expand forever.

The author is at the Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA. E-mail: mlivio{at}stsci.edu

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