On the bookshelves of just about every practicing cosmologist (or at least those of a certain age, like me) you will find a copy of Steven Weinberg's Gravitation and Cosmology (1). What made this 1972 book such a classic was not just its combination of clarity and mathematical rigor but also its service as a kind of manifesto for a newly emerging scientific discipline. Not until the completion of Einstein's general theory of relativity in 1916 was it possible to embark on the most ambitious project in the history of physical science: the construction of a self-contained theory of the origin and evolution of the cosmos and all its contents.
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