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Cosmology is the study of the Cosmos, or the Universe. While "Cosmos" or "Universe" technically includes everything, it generally means the study of space at the largest scales: the universe itself, its structure, how and when it began, and so on.

Ptolemy, however, thought the Cosmos was much smaller than we think of it today, and Ptolemy's studies focused on the four planets that were known at the time (Mercury, Venus, Jupiter, and Saturn), and the several thousand stars that are visible to the naked eye.

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