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.

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Occupation: astronomer, photographer, physicist, geologist
Position held: president, chairperson, president of the French Academy of Sciences
Citizenship: France
Born: February 22, 1824
Died: December 23, 1907

Facts from Wikidata (CC0). Image by Unknown author via Wikimedia Commons (Public domain).

Pierre Janssen

French astronomer (1824-1907)

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About Pierre Janssen

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here now

Occupation: astronomer, photographer, physicist, geologist
Position held: president, chairperson, president of the French Academy of Sciences
Citizenship: France
Born: February 22, 1824
Died: December 23, 1907