Which gas was discovered first in the chromosphere of the sun?
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The first evidence of helium was obtained on August 18th, 1868 by French astronomer Jules Janssen. While in Guntur, India, Janssen observed a solar eclipse through a prism, whereupon he noticed a bright yellow spectral line (at 587.49 nanometers) emanating from the chromosphere of the Sun.
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Helium gas was first discovered in the chromosphere of the sun.
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