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Updated: May 13, 2025
This luminous suggestion was held more or less in abeyance for half a century. Then it was elaborated by Zollner, and particularly by Bredichin, of the Moscow observatory, into what has since been regarded as the most plausible of cometary theories. It is held that comets and the sun are similarly electrified, and hence mutually repulsive.
But their particular distinction lay in the multitude of stars begemming the background. He had already formed the project of extending Argelander's "Durchmusterung" from the point where it was left by Schönfeld to the southern pole; and his ideas regarding the means of carrying it into execution crystallised at the needle touch of the cometary experiments.
After being lost for 300 years, this drawing was recovered by the prolonged efforts of Mr. When Wells's comet, in 1882, approached very close indeed to the sun, the spectrum changed to a mono-chromatic yellow colour, due to sodium. For a full account of the wonders of the cometary world the reader is referred to books on descriptive astronomy, or to monographs on comets.
Investigation of the known cometary orbits, combined with theoretical considerations, has led some astronomers to the conclusion that as the sun travels onward through space he ``picks up en route'' cometary masses which, without belonging strictly to his empire, are borne along in the same vast ``cosmical current'' that carries the solar system.
He, moreover, provided a formula for computing the movement of a particle under the influence of a repulsive force of any given intensity, and thus laid firmly the foundation of a mathematical theory of cometary emanations. Professor W. A. Norton, of Yale College, considerably improved this by inquiries begun in 1844, and resumed on the apparition of Donati's comet; and Dr.
It has, moreover, to meet the exigencies of the day, a pretty sprinkling of cuts and plates, respecting the number of which we do not quarrel; in the choice of some of them we must, however, dissent from the editor. The Astronomical portion, by Mr. Barker, is unusually copious, and the cometary plates are well executed.
This tail was multiple, and multiple in a most curiously variable manner. It divided up into many thin nebulous streaks, the number and relative lustre of which underwent rapid and marked changes. Their permanent record on Barnard's and W. H. Pickering's plates marked a noteworthy advance in cometary photography.
But before it closed, its cultivation had received a powerful stimulus through the invention of an improved method. The name of Olbers has already been brought prominently before our readers in connection with asteroidal discoveries; these, however, were but chance excursions from the path of cometary research which he steadily pursued through life.
There are other planets in this system, all of them more or less conforming to the plane of the ecliptic. Anvhar is obviously a rogue, perhaps a captured planet of another sun. For the greatest part of its 780-day year it arcs far out from its primary, in a high-angled sweeping cometary orbit.
The idea of cometary systems was first suggested by Thomas Clausen in 1831. It was developed by the late M. Hoek, director of the Utrecht Observatory, in 1865 and some following years. He found that in quite a considerable number of cases, the paths of two or three comets had a common point of intersection far out in space, indicating with much likelihood a community of origin.
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