Planners of the trip had computed several possible routes to Mars. The shortest, a mere 40 million miles, would be undertaken when our earth and Mars were nearest each other. Such a route would be like cutting across a vacant lot from one street to the next parallel street. However, there would be fences to climb in the form of the sun's pull of gravity. The ship would have to use power from the first day till the last, and much pay load would have to be sacrificed.
The second route would use a minimum of fuel and maximum time. We would accelerate to an orbit intersecting the paths of the earth and Mars. Then the motors would be cut and we would coast in free flight to our destination, where we would decelerate. But such a trip would take from five to seven years.
Our actual path was a compromise between the two. We would use a minimum of fuel and a minimum of time. It was faster than plan 2, but more economical than plan 1. We would accelerate to a good speed, coast awhile on the planned orbit, then decelerate. Had we enough supplies, we might have remained on Mars about three months. However, every ounce of supplies we would use on Mars had to be shipped separately on conventional, unmanned rocket ships which were now orbiting Mars. Three ships of this type had been fired from the earth two years before. One of these would take us from the Jehad and back again, just as we had boarded the Jehad from the earth. The other two would be left on Mars.
But only three weeks of supplies could be shipped. After our return to the Jehad, we would orbit for about 75 days, when Mars and the earth would be in position for our return trip.
Even though we had more work than usual, the trip grew boring after Gail and I completed our disciplinary duty. Then we changed our "day" from 25 to 24 hours, replacing the five-hour shifts, which had included a shift for Morrie, to six-hour shifts. Following through on our dull routines, we realized why Morrie had cracked up. But the rest of us showed no signs of this, and even Joel bore up well. Perhaps the headshrinkers who passed on us were entitled to one mistake. We figured one despite the fact that Dr. Spartan could not be considered a direct hit on the psychological target. However, Spartan was a good spaceman, just as Nero had been good at his job, though more than slightly cracked.
Then, as we neared the end of the middle stage of the trip, we picked up a new kind of signal from Mars on our electronic equipment. The first, undoubtedly a radar beam, continued as before. But the second was on a longer wave length and was undoubtedly a radio transmission. It came to us as a deep chirping sound, and Axel suggested the Martians were trying to communicate with us.
"Maybe words of welcome," he said, adding, "or warning against trespassing."
Then the middle portion of our voyage ended. Mars was now a discernible disc and the gyroscope twisted the ship around so that its tail was headed toward our destination. The motors were fired and the long period of deceleration began.
While this was being done by Spartan, with Joel assisting him in the control room, Gail, Axel and I were together in the main cabin, and we had our first full discussion on what might lie ahead.
"Spartan might have had a change of heart," Gail said, always hopeful. "He really hasn't done anything out of line since he tried to take Bill's life."