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staedtler staedtler
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7 years ago
In 1868, astronomers observed a spectral line in the Sun at a wavelength where they had never seen a spectral line before, even in laboratory sources, although other solar spectral lines were where they were expected to be. The logical conclusion that they reached based on this observation was that

(a)   they had found a previously undiscovered element.
(b)   gas in that part of the Sun was moving very rapidly towards or away from them, causing that spectral line to become Doppler-shifted to a new wavelength.
(c)   the temperature of this portion of the Sun was much higher, or possibly much lower, than anyone had ever expected.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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hyponoticahyponotica
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staedtler Author
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7 years ago
Person Raising Both Hands in Celebration

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