Pierre Janssen
French astronomer (1824-1907)
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Summary
Updated 2026-06-19
Pierre Jules César Janssen, 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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Falling52.3
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Historical22.1
Source confidence65.0
Completeness75.0
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- Pierre Jules César JanssenLow confidencewikipedia · lb.wikipedia.org
- بيير جانسينLow confidencewikipedia · ar.wikipedia.org
- پيير جانسنLow confidencewikipedia · ary.wikipedia.org
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