The average density, as deduced by Shapley[116] from the movements of double stars, is about one-eighth the solar density.
The other reason is that if our inferences as to the electrical effect of the sun on the earth and of the planets on the sun are correct, double stars, as we have seen, must be much more effective electrically than single stars.
Account of the Changes that have happened during the last Twenty-five Years in the relative Situation of Double Stars; with an Investigation of the Cause to which they are owing.
Continuation of an Account of the Changes that have happened in the relative Situation of Double Stars.
Sir William Herschel's catalogues of double stars offer a considerable number to which he ascribes a decided green or blue tint.
Albireo, in the constellation of the Swan, is one of the loveliest of double stars.
Indirect methods have been proposed, for ascertaining the parallax of the fixed stars, by means of observations on the double stars.
Within five years he discovered nearly seven hundred double stars, and during his life, he observed no less than twenty-four hundred.
If this is true, the Classes G and K; double stars are effectively older than Classes A and F double stars, and these in turn are effectively older than Class B double stars.
Still farther south and nearly in a line drawn from alpha through beta we find a remarkable group of double stars, sigma, pi, rho, and omicron.
This is brilliant and easily resolved into its components, which include a number of double stars.
An excellent list of double stars kept up to date, will be found in the annual Companion to the Observatory, published in London.
While the group of double stars in the southern part of Corona Borealis consists, as we have seen, of remarkably close binaries, another group in the northern part of the same constellation comprises stars that are easily separated.
He also discovered 806 double stars, which he proved were really corrected from the fact that they revolved round each other (p.
He announced in 1844 that both Sirius and Procyon were double stars, but that their companions, though large, were dark, and therefore invisible.
He has already found about 900 double stars, and almost as many nebulæ.
The sidereal heavens contain few more interesting objects for the telescope than can be found in the numerous class of double stars.
A pleasing class of double stars is that in which we have the remarkable phenomenon of colours, differing in a striking degree from the colours of ordinary stars.
It is, however, a very interesting example of that remarkable class of objects known as double stars.
The first systematic piece of practical astronomical work which John Herschel undertook was connected with the measurement of what are known as "Double Stars.
In consequence of this beautiful discovery, the attention of astronomers was directed to the subject of double stars with a degree of interest which these objects had never before excited.
Paper after paper was sent to the Royal Society, describing the hundreds, indeed the thousands, of objects such as double stars; nebulae and clusters, which were first revealed to human gaze during those midnight vigils.
For the assiduity with which the measurements on the diameter of the Georgium Sidus, and observations of other planets, double stars, etc.
But all these troubles were removed when I knew my brother to be at no great distance making observations, with his various instruments, on double stars, planets, etc.
The following notes are from Burnham's recently published General Catalogue of Double Stars.
This proportion of double stars is not, however, the same for all parts of the sky; while in some regions double stars are very scarce, in other places the proportion rises to 1 in 8.
All these have been found by the use of the telescope, but during the last quarter of a century the spectroscope has opened up a new world of double stars of enormous extent and the highest interest.
This is the case even with close telescopic double stars, owing to their enormous remoteness from us.
Among the many unexplained stellar problems there is one noticed indouble stars that is thought by some to be likely to throw light on stellar evolution.
So we find parallax, proper motion, double stars, binary systems, variable stars, and new stars all bound together.
Sir William Herschel began his observations of double stars in the hope of discovering an annual parallax of the stars.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "double stars" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
