Pierre Janssen
French astronomer (1824–1907) / From Wikipedia, the free encyclopedia
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For the Belgian footballer, see Pier Janssen.
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.