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The Uncertain Heavens: Christiaan Huygens' Ideas of Extraterrestrial Life – The Public Domain Review
Christiaan Huygens - Wikipedia
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Christiaan Huygens and the biggest telescopes of the 17th Century - Telescope Nerd
Christiaan Huygens - World History Encyclopedia
The Uncertain Heavens: Christiaan Huygens' Ideas of Extraterrestrial Life – The Public Domain Review