Olmsted, Denison, 1791-1859. [from old catalog] · New York, R. B. Collins · leaf 237
a regular gradation of comets, from such as are com-posed merely of a gaseous or vapory medium, to thosewhich have a well-defined nucleus. In some instanceson record, astronomers have detected with their tele-scopes small stars through the densest part of a comet. The Tail is regarded as an… … These several parts are exhibited in figure 48, whichrepresents the appearance of the comet of 1680. 2*1*1. Of what three parts does a comet consist ? Describe each. COMETS, 223 278. The number of comets belonging to the solarsystem, is probably very great. Many, no doubt, escapeobservation by…
Astronomy
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