The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 232
ity farbelow that of hydrogen, which is the lightest substance ofwhich we have any knowledge. I can hardly be an alio- ASTRONOMY. 209 tropic form of any terrestrial element, as some scientists havesuggested; for in the most violent disturbances in prominencesand near sun-spots, when the lines of… … Fig. 22Q. For the present it remains, like a few other lines in the spec-trum, an unexplained mystery. Besides bright lines, the corona shows also a faint continu-ous spectrum, in which have been observed a few of the moreprominent dark lines of the solar spectrum. This shows, that, while the…
Astronomy
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