Pierre Janssen
French astronomerWikipedia
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Search complete. 1 mention across 1 episode found for "Pierre Janssen".
Oct 23, 2026
Mark EllisonHOST
Which element was discovered in the sun before? On Earth, answer helium.
Mark EllisonHOST
Pierre Janssen and Joseph Norman Lockyer observed helium's distinctive D3 line in the solar spectrum.
Mark EllisonHOST
It wasn't isolated on Earth until 1895, confirming the celestial discovery.
Mark EllisonHOST
Question 3.