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Christiaan Huygens - Wikipedia
Huygens (spacecraft) - Wikipedia
Christiaan Huygens | Dutch Astronomer, Physicist & Mathematician
Christiaan Huygens - World History Encyclopedia
Christiaan Huygens summary | Britannica
Biography of Christiaan Huygens, Inventor of the Pendulum …
Christiaan Huygens (1629 - 1695) - Biography - MacTutor History …
Christiaan Huygens - New World Encyclopedia
Christiaan Huygens Biography | Space
Christiaan Huygens - NASA Science