. The Astrophysical journal. der Gegenwart, Dritter Teil, Dritte Abteilung: Physik, E. Warburg, ed. (H. G. G.) ...... 250 NUMBER IV Ox AN Apparatus and Method for Thermo-electric measure-ments IN Photographic Photometry. I. Harlan True Stetson 253 The Nature of the Constant-Error Term Found in the Deter-mination OF the Solar Motion from Radial D. Perrine 286 A Morse Optical Pyrometer Adapted to a Wide Range of Laboratory Uses. W. E. Forsythe 295 A Note on Spectrophotography. M. Luckiesh .... 302 Monochromatic Photography of Jupiter axd Saturn. R. W. Wood 310 Orbit of the Spectros
. The Astrophysical journal. der Gegenwart, Dritter Teil, Dritte Abteilung: Physik, E. Warburg, ed. (H. G. G.) ...... 250 NUMBER IV Ox AN Apparatus and Method for Thermo-electric measure-ments IN Photographic Photometry. I. Harlan True Stetson 253 The Nature of the Constant-Error Term Found in the Deter-mination OF the Solar Motion from Radial D. Perrine 286 A Morse Optical Pyrometer Adapted to a Wide Range of Laboratory Uses. W. E. Forsythe 295 A Note on Spectrophotography. M. Luckiesh .... 302 Monochromatic Photography of Jupiter axd Saturn. R. W. Wood 310 Orbit of the Spectroscopic Binary B. D. 78°4i2 Oliver J. Lee 320 CONTENTS vii NUMBER V PACE On an Apparatus and Method for Thermo-electric Measure-ments IN Photographic Photometry. II. Application toVariable Stars. Harlan True Stetson 325 The Production in the Electric Furnace of the Banded Spec-tra Ascribed to TiTANauM Oxide, Magnesium Hydride, andCalcium Hydride. Arthur S. King 341 Researches on Solar Vortices. Carl Stormer .... 347 H< Pi. O Si S PLh W O THE ASTROPHYSICAL JOURNAL AN INTERNATIONAL REVIEW OF SPECTROSCOPYAND ASTRONOMICAL PHYSICS VOLUME XLIII JANUARY I916 NUMBER I SOME OF THE DARK MARKINGS ON THE SKY ANDWHAT THEY SUGGEST By E. E. BARNARD Our knowledge of the universe is confined to the stars and theirattendant phenomena and to the nebulae. It is admitted thatthere are a great many dark stars, and there is even a claim thatthere are more dark than bright stars. This is entirely plausible,because we must assume that the stars ultimately die out or ceaseto give Hght. That they are everlasting, so far as their light isconcerned, is more than improbable. If this is reasonable withrespect to the stars, what can be said of the nebulae ? If we canfree ourselves from the beHef that the function of a nebula is tobecome a star, or stars, we can imagine some similar condition tothat of the stars to prevail among these great bodies, that is, thatthey may become dark in the course of time. Sho
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectspectru, bookyear1895
