The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 341
chgases would reflect no sunlight. It seems probable that thesecomets are really made up of acombination of small, solid par-ticles in the form of minutemeteoroids, and of gases whichare, perhaps, rendered luminousby electric discharges of slight^S- 355- intensity. 316. Physical Constiuiion of… … ASTRONOMY. 31? of the nucleus is at least equal to that of iron. As such acomet approaches the sun, the nucleus is, to a slight extent,vaporized, and out of this vapor is formed the coma and thetail. That some evaporating process is going on from the nucleusof the comet is proved by the movements…
Astronomy
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