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At least some of the bodies in heaven did not orbit the Earth.

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Collection of a few hundred million to a trillion or more stars, bound together by gravity

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A spherical cloud of cometary nuclei far beyond the Kuiper Belt

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(a) retrograde motion of the planets using the geocentric theory.

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B. their luminosity can be determined from their period of variation.

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The Moon is in the full moon phase and the Moon is on the ecliptic

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A warm starlike object that has too little mass to suppor fusion in its core.

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B. we are looking back to when the Universe was young in every direction

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