Page:Popular Science Monthly Volume 46.djvu/766

746 surrounded with a cloak of metallic vapors proportionately far more extensive than the sun's, yet, smothered as the great star



seems in some respects to be, it rivals Sirius itself in the intensity of its radiant energy.

If we suppose the radiation of Arcturus to be the same per unit of surface as the sun's, it follows that Arcturus exceeds the