Back بيير جانسين Arabic پيير جانسن ARY بيير جانسين (مصور من فرنسا) ARZ ژول ژانسن AZB Жул Жансен Bulgarian Pierre Janssen Catalan Pierre Janssen Czech Jules Janssen Danish Jules Janssen German Πιερ Ζυλ Ζανσέν Greek
Pierre Jules César Janssen (22 February 1824 – 23 December 1907), 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, but there is no justification for the conclusion that he deserves credit for the co-discovery of the element helium.
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