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Book I.
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NEW

CONJECTURES

Concerning the

Planetary Worlds,

THEIR

INHABITANTS

AND

PRODUCTIONS

Written by Christianus Huygens, and inſcribed to his Brother Constantine Huygens.

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BOOK the Firſt.

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A Man that is of Copernicus’s Opinion, that this Earth of ours is a Planet, carry’d round and enlighten’d by the Sun, like the reſt of the Planets, cannot but ſometimes think, that it’s not

A 4