On Aug. 18, 1868, a French astronomer named Pierre Jules César Janssen discovered helium while observing a total solar eclipse in India. Discover space history 👉 https://trib.al/qnIyp5D 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 any elements th
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Evidence of helium was first observed on this day in 1868 by French astronomer Pierre Janssen during a total solar eclipse. ☀️ Take a look at helium atoms forming in this amazing cloud chamber, as Christmas Lecturer Peter Wothers demonstrates. | Royal Institution of Great Britain
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