December 1970
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5 Reads
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6 Citations
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Publications (1)
Citations (1)
... Knowledge that helium [2,3] was first observed in the Sun by Pierre Jules César Janssen [4] and Joseph Norman Lockyer [5], before being discovered on Earth by William Ramsay [6], might prompt the belief that the element was abundant on the solar surface. In fact, helium has never been identified in the absorption spectra of the quiet Sun. ...
- Citing Chapter
December 1970