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Chapter 1 The Moon

If a planet is smaller than the earth, it does not need a moon. Very tall mountains then take the part of the moon which, for example, is the case with Venus, Mercury, Mars, and some other, much smaller planets; the larger planets must, however, be furnished with one or even several moons, so that these moons may render the above-mentioned services to their planets. – The Moon, Chapter 1, Paragraph 3

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