Additional rocket tubes were being installed, and the steel framework of a bulge now showed on the hull, this bulge being an additional fuel storage compartment that would provide a slight additional resistance and consequently lower speed in the lower levels, but would prove little hindrance in level six and none at all in outer space.
When Hart emerged from his office he appeared to be very tired, indeed, but his face bore an expression of triumph that could not be mistaken. He and this little scientist from Washington had evidently arrived at some momentous conclusion regarding the enemy.
"Jack," he said, when he reached my bench during his first round of the hanger, "celestial mechanics is a wonderful thing. I had a hunch, and this astronomer chap has proved it correct with his mathematics. Our friend the enemy is out there in space at a point where his own mass and velocity are exactly counteracted by those of the earth and its satellite, the moon. He is just floating around in space, doing no work whatsoever to maintain his own position. He has temporarily assumed the rôle of a second satellite to us and is revolving around us at a definite period that was calculated by Lindquist. The gravitational pull of the moon keeps him from falling to the earth and that of the earth keeps him from approaching the moon. The resultant of the set of forces is what determines his orbit and the disturbance in the normal balance is what has been observed by the astronomers who reported changes in the tides and in the moon's orbit."
"
But Lindquist's figures prove that the vessel or fleet of the enemy must be of tremendous size to produce such discrepancies, infinitesimally small though they might seem. We have a big fellow with whom to deal, but we know where to find him now."
"How can he work from a fixed position to make his attacks on the earth at such widely separated points?" I asked.
"It isn't a fixed position in the first place, and besides the earth rotates once in twenty-four hours, while the moon travels around the earth once in about twenty-eight days. But, even so, the widespread destruction could not be accounted for. He must send out scouting parties or something of that sort. That is one of the things we are to learn when we get out there. We'll have some fun, Jack."
"Will the Pioneer be ready?" I asked. Evidently I was to go.
"She will, with the exception of the acceleration neutralizers. But I'm having some heavily-cushioned and elastic supports made that will, I believe, save us from injury. And I guess we can stand the discomfort for once."