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What has been said about the motion of Sirius brings us to another aspect of this subject. The fact is, that in every case of stellar dragon trainer 2 ita 1080p the displacement that we observe represents only a part of the actual movement of the star concerned. There are stars whose motion dragon trainer 2 ita 1080p them straight toward or straight away from the earth, and such stars, of course, show no cross motion. But the vast majority are traveling in paths inclined dragon trainer 2 ita 1080p a perpendicular to our line of sight. Taken as a whole, the stars may be said to be flying about like the molecules in a mass of gas. The discovery of the radial component in the movements of the stars is due to the spectroscope. Spectroscopic observation, then, combined with micrometric measurements of the cross motion, enables us to detect the real movement of the star in space. This indicates that it is revolving around a near-by companion, which is often invisible, and superposed upon this motion is that of the two stars concerned, which together may be approaching or receding or traveling across the line of sight.