And now, in obedience to another order, our ship began to slant sharply up toward the mighty circle's upper limb, followed by the half-hundred ships behind us. And as we lifted higher and higher the circle changed before our eyes into a sphere--a tremendous, faintly glowing sphere of size inconceivable, filling the heavens with its vast bulk, feebly luminous like the ghost of some mighty sun, rushing through space to meet us as we sped up and over it. And now at last we were over it, sweeping above it with our little fleet at a height of a half-million miles, contemplating in awed silence the titanic dimensions of the faint-glowing sphere beneath us. For in spite of our great height above it, the vast globe stretched from horizon to horizon beneath us, a single smooth, vastly curving surface, shining with the dim, unfamiliar light whose source we could not guess. It was not the light of fire, or glowing gases, for the sun below was truly a dead one, vast in size as it was. It was a _cold_ light, a faint but steady phosphorescence like no other light I had ever seen, a feeble white glow which stretched from horizon to horizon of the mighty world beneath. Dumfoundedly we stared down toward it, and then, at a signal to the pilot, our ship began to drop smoothly downward, trailed by our forty-odd followers behind. Down, down, we sped, slower and slower, until we suddenly started as there came from outside the ship a high-pitched hissing shriek. [Illustration: "The vast globe stretched from horizon to horizon beneath them."] "Air!" I cried. "This dark star has an atmosphere! And that light upon it--see!" And I flung a pointing hand toward the surface of the giant world below. For as we dropped swiftly down toward that world we saw at last that the faint light which illuminated it was not artificial light, or reflected light, but light inherent in itself, since all the surface of the mighty sphere glowed with the same phosphorescent light, its plains and hills and valleys alike feebly luminous, with the soft, dim luminosity of radio-active minerals. A shining world, a world glowing eternally with cold white light, a luminous, titanic sphere that rushed through the darkness of infinite space like some pale, gigantic moon. And upon the surface of the glowing plains beneath us rose dense and twisted masses of dark, leafless vegetation, distorted tree-growths and tangles of low shrubs that were all of deepest black in color, springing out of that glowing soil and twisting blackly and grotesquely above its feeble light, stretching away over plain and hill and valley like the monstrous landscape of some undreamed-of hell!