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Pierre Janssen

For the Belgian footballer, see Pier Janssen.

Jules Janssen; photograph by Nadar (date unknown)
Photo taken by Janssen, from the Meudon observatory, of Renard and Krebs' La France dirigible (1885)

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, and with some justification the element helium.

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