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WORLDKINGS - On This Day - August 18, 2018 - French Astronomer Pierre Janssen discovers helium in solar spectrum during eclipse in 1868

18-08-2018

(Worldkings.org) A French astronomer spots an unknown element, now known as helium, in the spectrum of the sun during a much-anticipated total eclipse. The event marks the first discovery of an "extraterrestrial" element, as helium had not yet been found on Earth.

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