Chapter 1 The Moon

If a planet is smaller than the earth, it does not need a moon, and the place of the moon is taken by very high mountains, which is the case, for example, with Venus, Mercury and Mars and some other much smaller planets; but what the larger planets are, they must be provided with one or also several moons in order to render the already known service to their planet. – The Moon, Chapter 1, Paragraph 3

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