Pierre Janssen

For the Belgian footballer, see Pier Janssen.

Pierre Janssen
Jules Janssen; photograph by Nadar (date unknown)
Born(1824-02-20)20 February 1824
Paris, France
Died23 December 1907(1907-12-23) (aged 83)
Meudon, France
Scientific career
FieldsAstronomy
ThesisSur l'absorption de la chaleur rayonnante obscure dans les milieux de l'oeil (1860)

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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