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Pierre Janssen

1824–1907

France

astronomer

Linked elements

  • 2 Helium (He)

Guides & chronologies

  • Themes
  • Historical timeline guide
  • World history chronology
  • Kings of France timeline
  • Popes timeline
  • Gauls & Alesia
  • Editorial method
  • Periodic table
  • Element timeline
  • Interactive timeline →

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World history timeline.

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