radiation era
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radiation era
(′rād·ē′ā·shən ′ir·ə)
(astronomy) The period in the early universe, lasting from roughly 20 seconds to 105 years after the big bang, when photons dominated the universe.
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McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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