them for battle, instead of flight, speeding out in them to this planet of Alto's, attacking these globe-people and using their own force-ray projector in an attempt to swerve Alto aside before it destroys us. And that is the decision which you must make, a decision on which rests the fate of the races of man. Shall a few of us flee in these star-cruisers to another universe, allowing the oncoming sun to destroy our own, or shall we go out in them to Alto and make a single desperate attempt to swerve the approaching sun aside, and save the Eight Worlds?"

And now again there was silence, a thick and heavy silence, fateful with the doom of universes, the destiny of suns. I felt sleep overwhelming me, now, and though I struggled to keep my tired eyelids open I was slipping farther and farther down into drowsy depths of oblivion. Dimly, as though from an infinite distance, I heard a mighty shouting rising from the massed members around me. Then, just before complete unconsciousness descended on me, the roaring lessened for a single moment, and in that moment I heard the voice of Mur Dak, strong and vibrant.

"You have made decision," he was saying, "and when the cruiser-fleet is completed it shall start at once—for Alto!"

The three weeks that elapsed between our return and the sailing of the great fleet were undoubtedly the most frenzied in the history of the Eight Worlds. Our own scientists had calculated that if we were to save our universe, Alto must be swerved from its course within the next fifty days, since after that it would be too late, for even if swerved aside after that time the dying sun would still crash through at least part of our solar system, wrecking it completely. We must reach the ray-projector on Alto's planet and use it before the end of the fiftieth day, or it would be too late.

So through the first twenty of those fifty days all other work throughout the Eight Worlds had been abandoned and every effort was concentrated upon the completion of the cruisers. Each planet was furnishing its own contingent for the fleet, and on each of the Eight Worlds men toiled to exhaustion in laboratory and factory, while others stood ready to take their places. Swiftly the cruisers, more than a thousand in number, approached completion, and now were being equipped with the weapon our scientists had devised for them, a deadly blue ray which had the power of stimulating atomic movement in every molecule of matter it touched to such a point that whatever matter was struck by it vanished beneath its touch, splitting instantly into its original 

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