Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 341
sintegrated intometeoroids. Physical and Chemical Constitution of Comets. 315. Physical Constitution of Telescopic Comets. — We haveno certain knowledge of the physical constitution of telescopic comets. They are usually tensof thousands of miles in diame-ter, and yet of such tenuity thatthe… … they are composed, in part at least, of incandescent gases. Itis, however, difficult to conceivehow these gases become suf-ficiently heated to be luminous;and at the same time suchgases would reflect no sunlight. It seems probable that thesecomets are really made up of acombination of small, solid…
Astronomy
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