The Works of Galileo

Starry Messenger (1610)

An Earth-like Moon

Galileo’s discovery entailed more than just mapping the Moon: Galileo argued that the Moon and the Earth are similar kinds of bodies. They both have mountains, seas, atmospheres, and both shine by reflected light. All this might suggest that the Earth, also, is a wandering planet. (Figure 1)

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Galileo, 1610.

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Exhibit credit: Kerry Magruder, with the assistance of , Marilyn B. Ogilvie, Duane H. D. Roller.

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