Pierre 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.
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by Zadkine, Ossip
[Arnhem : Het Museum, 1954
Other Authors:
“...Janssen, Pierre, 1926-...”[Arnhem : Het Museum, 1954
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