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 16 August
Lockyer was a British astronomer who, in 1868, discovered and named the element helium that he found in the Sun's atmosphere. Helium was not detected on Earth until years later.
He also applied the name chromosphere for the Sun's outer layer. Lockyer discovered, together with P. J. Janssen, the prominences (the large red/orange flame-like eruptions of gas) that surround the solar disk. Last update: 16 August 2004
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