Pierre Janssen

Pierre Janssen

Pierre Jules César Janssen (22 February 1824 – 23 December 1907), usually known in French as Jules Janssen, was a French astronomer who, along with the English scientist Joseph Norman Lockyer, is credited with discovering the gas helium.

Read more about Pierre Janssen:  Life, Work, and Interests, Discovery of Helium, Observatories, International Meridian Conference, Death, Honors, and Legacy, In Popular Media