2.1K views · 115 reactions | On Aug. 18, 1868, a French astronomer...
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2.1K views · 115 reactions | On Aug. 18, 1868, a French astronomer...
Space.com. . 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 ...
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