Pierre Janssen - Alchetron, The Free Social Encyclopedia
Pierre Janssen - Alchetron, The Free Social Encyclopedia
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18. August 1868 Pierre Jules César Janssen entdeckt Helium
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On Aug. 18, 1868, a French astronomer named Pierre Jules César Janssen discovered helium while observing a total solar eclipse in India. Space History Archives👉 https://space-com.visitlink.me/DZc8T4 During the eclipse, Janssen was using a spectroscope to look at the spectrum of light emitted by the sun. This tool allows scientists to determine what elements they're looking at. While observing solar prominences during the eclipse, Janssen noticed a bright yellow line that didn't correspond to an
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On Aug. 18, 1868, a French astronomer named Pierre Jules C…
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