IN RECENT YEARS the active frontiers of cosmology have widened and certain aspects of the subject are attracting more attention from physicists. Growing emphasis on physics has been stimulated by discovery of the universal black‐body radiation and by growing realization that the composition of the universe was once extremely complex.
The early universe
Edward R. Harrison; The early universe. Physics Today 1 June 1968; 21 (6): 31–39. https://doi.org/10.1063/1.3035005
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