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Updated: June 29, 2025
An instructive example is that of the chromospheric element helium. Father Secchi remarked in 1868 that there is no dark line in the solar spectrum matching its light; and his observation has been fully confirmed. Helium-absorption is, however, occasionally noticed in the penumbræ of spots. Our terrestrial vital element might then easily subsist unrecognisably in the sun.
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