Person

Pierre Janssen

French astronomer

b. 1824 CE – d. 1907 CE World The Great Crossroads

Pierre Jules César Janssen (22 February 1824 – 23 December 1907), usually known in French as Jules Janssen, is a French astronomer who, along with the English scientist Joseph Norman Lockyer, is credited with discovering the gas helium.

Moran, J. (2017). Pierre Janssen. History Atlas. Retrieved 10 November 2026, from https://www.historyatlas.com/people/pierre-janssen/

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