P.J.C. Janssen
Actor | Director | Cinematography
Pierre Jules César Janssen, also known as Jules Janssen, was a French astronomer who, along with the English scientist Joseph Norman Lockyer, is credited with discovering the gaseous nature of the solar chromosphere, and with some justification the element helium.
Place of Birth: France
Date of Birth: Feb 22, 1824
Date of Death: Dec 23, 1907
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