He turned to switch on their radio receiver, and he set it for the newscasting waves that went forth from the most powerful station of Earth, the Press Tower of New York. A voice came to them faintly. For a time it vied with the muffled roar of their thundering exhaust; then it lost volume, faded, and was finally gone. Their last contact with Earth was severed. There remained only blackness, and a great abyss through which they were plunging. * * * * * Harkness busied himself with calculations. He would have spoken, but the silence that followed the vanished voice of Earth had robbed his own voice of control. A telescope sight was fixed rigid with the axis of their ship. He looked through it, moved their controls, and brought the cross-hairs of his instrument to bear upon a star. "That's about right," he said quietly. "I got all the information that the observatories had on the orbit of the Dark Moon. It is circling the Earth from north to south. It coincided for a short time with our own moon when it first hit; that's what kicked up the big wave and jarred us up. But it swung off and seems to have settled down in its own orbit now. "Two hundred thousand miles away is what they make it, though I think that is more or less of a guess. I wish we could measure our speed." He looked at the earth-induction speed-indicator. Useless now, it registered zero. "Well," he added, "we are shooting for the North Star. We will pass close to the Dark Moon's orbit; it should be about over the Pole on this date. And there is one good safe bet, anyhow; there is nothing between here and there to stop us." He was being weakly facetious, but his efforts met with an enthusiastic response. The tension of the moment, it was plain, had not affected Harkness alone. But it was many hours before the error of his statement was made manifest to all. An island, faintly luminous, lay ahead. It grew to enormous size as they dashed upon it. Harkness sprang for the controls, but, before he could reach them, they had struck the vast field of pale green light, flashed through it, and left it diminishing in size behind them. Then, other lights, not brilliant, but like phosphorescent bodies, that came and went and flashed by with blinding speed. * * * * * Another luminous area rushed at them from ahead. At first it was a speck, then an island, and then a continent in size, and through it moved other brighter lights. This time a slight suggestion of an impact was felt. Here was matter of a form they could not guess. It was Chet who pointed to the glass of their control room. The heavy lights of the lookouts were smeared with sticky fluid that drew together in trickling streams. "Nothing between us and the Dark Moon?" he asked of Harkness. "And space is an empty void? We Earth-creatures are a conceited lot." "Meaning?" the girl questioned.