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About the Cover

Cover Figure


COVER Disks represent an aging and expanding universe. Work this year confirmed a bizarre story of how the cosmos was born and what it is made of. Dark energy is the primary ingredient in a universe whose expansion rate and age are now known with unprecedented precision. See the Breakthrough of the Year special section and the accompanying Editorial. 2038. [Image: Cameron Slayden]

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