Page 485 - 89 history of astronomy_opt

continuous, indicating light reflected from
the sun’s body. But it also shows a green
line corresponding with no known terres-
trial element, and the name ”coronium” has
been given to the substance causing it.
A vast number of facts have been added
to our knowledge about the sun by photog-
raphy and the spectroscope. Speculations
and hypotheses in plenty have been offered,
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