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Comets (Classic Reprint)

  • Fester Einband
  • 24 Seiten
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Excerpt from CometsBy'far the larger number of comets have no trains, and are too faintly luminous to be often seen without a tel... Weiterlesen
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Excerpt from Comets

By'far the larger number of comets have no trains, and are too faintly luminous to be often seen without a telescope. These are divided into two classes: those. Without a nucleus, but of uniform density throughout their whole mass; and those having a nucleus or head, which is the brightest and most condensed part of. The comet. Comets of this latter class are often of vast magnitude, but of extreme lightness, and having but a small quantity of matter, as compared with their bulk. Comets having a train accompanying the main body constitute a third class. It is only the members of this latter class that are generally seen by the unaided eye. The hair-like appearance of the train procured for these bodies' the name comet, from the Greek word coma, meaning hair. These trains are really most wonderful. The closest and most careful investigations with our improved astronom ical instruments, while definitely settling some points, have, in the main, deepened our desire to know, and yet fallen short of perfectly satisfactory results. However, with thedata at hand, an interesting and far from profitless study may be made of their composition, rapidity of formation, Number of length, and number, or divisions. The train of a trains comet does not always remain single, but fre quently separates into two', three, or more tails; The comet of 1744 had its fan-shaped train separating into six streamers. Its edges were very bright, while the middle was of fainter light. Altogether it presented a most beautiful and mag nificent appearance. The one which so terrified pope' Calix tus in 1456 had a train curved like a cimeter, or rather like the graceful form of an ostrich feather. It was this p0pe who gave to the Roman Catholic Church the prayer, Lord, save us from the devil, the Turk, and the comet. A great victory was claimed for the powerful pope, when the comet, which had been duly anathematized and excommunicated, began to recede, and soon disappeared.

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Titel: Comets (Classic Reprint)
EAN: 9780666117342
ISBN: 0666117349
Format: Fester Einband
Anzahl Seiten: 24
Gewicht: 195g
Größe: H229mm x B152mm x T6mm
Jahr: 2018