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The main object of astronomy, as of all science, is not the collection of facts, but the development, on the basis of collected facts, of satisfactory theories regarding the nature, mutual relations, and probable history and evolution of the objects of study. Before the existing data appear sufficient to justify the attempt to form such a general theory, two policies of investigation may be followed: (1) to collect masses of information, as accurate and extensive as possible, by well testeddoi:10.1073/pnas.5.10.391 pmid:16576410 pmcid:PMC1091622 fatcat:c2u4pgposvaenniso732fpulse