PerspectiveAstronomy

Cosmology at a Crossroads

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Science  11 Sep 2009:
Vol. 325, Issue 5946, pp. 1347-1348
DOI: 10.1126/science.1172427

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Summary

A fundamental question in cosmology is, “How did the universe begin?” The two pivotal ideas of inflation and cold dark matter (CDM), combined with extensive observational results, including the unpredicted accelerated expansion of the universe, underpin a new standard model of cosmology.