Pierre Janssen
✶February 22, 1824
†December 23, 1907
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✶February 22, 1824
†December 23, 1907
Would you like to keep memories of someone else?
Pierre Jules César Janssen, usually known as Jules Janssen, was a French astronomer who, along with English scientist Joseph Norman Lockyer, is credited with discovering the gaseous nature of the solar chromosphere, and with some justification the element helium.
French astronomer (1824-1907)
Biography from the article Pierre Janssen on the English Wikipedia, available under CC BY-SA 4.0.