In the Ptolemaic Greek. model of the universe, the stars are attached to the___________ .

Question

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In the Ptolemaic Greek model of the universe, the stars are believed to be attached to the celestial sphere, a concept inherited from ancient Greek astronomy. This sphere was thought to be a giant, imaginary hollow sphere surrounding the Earth, to which all stars and planets were attached. The concept of the celestial sphere was used to explain the apparent movements of these celestial objects in the sky.