"That flicker of light," he said: "you see it?"
I bent forward, gazing to where he was pointing in the heavens before us, and then at last made out in the blackness, not far to the right of the glowing Andromeda universe, another patch of light of equal size, but one whose light was so dim as only to be seen with straining eyes. A mere dim flicker of light it was, in that crowding darkness, but as I gazed at it the nature of it suddenly came clearly to my mind, and I uttered a low exclamation myself.
"The universe of the serpent-creatures." I said. "It's the dying universe from which they came to invade our own."
He nodded. "Yes. It's nearer the Andromeda universe than our own, too."
I saw that he was right, and that the two universes, that of Andromeda and this dim, dying one, lay comparatively close to each other, and at almost equal distances from our own, the two forming the base of a long, narrow triangle of which our own universe was the apex. Together we gazed toward that dim flicker of light, in a thoughtful silence. We knew, even as we gazed, what great preparations were going on in that dying universe for the conquest of our own galaxy, what mighty efforts the serpent-races there were making, to complete their vast fleet and the strange, huge weapon which the records we had captured had mentioned, so that they could flash through the void to pour down on our galaxy. The knowledge held us wrapped in thought as our great ship raced on, still holding to its tremendous utmost velocity, rocking and swaying a little as it plunged through the vast ether-currents which swirled about us here in outer space.
Gradually, as we two stood in silence with our great craft speeding on, I became aware that during the last few minutes the air inside the pilot room had become perceptibly warmer, and that its warmth was still increasing. I glanced at the dial that registered the output of our heat-generators, but it was steady at its accustomed position; yet with each moment the warmth was increasing, until within a few minutes more the heat about us had become decidedly uncomfortable. Korus Kan, too, had noticed it, and had now swung backward the control of the heat-generators; yet still the warmth increased, the heated air in the pilot room rapidly becoming unbearable. I turned to the Antarian, fully alarmed now, but as I did so the door snapped open and Jhul Din burst up into the pilot room.
"What's happening to the ship?" he cried. "Its inner walls are getting almost too hot to touch."
In stunned surprise we gazed at each other, our heating-mechanisms turned completely off now, yet the inside-temperature dial's arrow was still moving steadily forward! The thing was beyond all reason, we knew, and for an instant we stood in amazement, the heat increasing still about us. Then suddenly Jhul Din pointed upward toward the massed dials above the controls, his arm quivering.
"Look!" he cried. "The outside-temperature dial." Swiftly we raised our own eyes toward it, the dial upon which was shown the temperature outside the ship. It should have shown absolute zero, we knew, as always in the infinite cold of empty space. But now it did not, and our eyes widened as we stared at it, in utter astonishment and fear. For it registered a temperature of thousands of degrees in the empty void about us.
"Heat!" I cried. "Heat in empty outer space. It's unthinkable."