“The rest of us have been confined together for more than two weeks at Star City,” Tony Reed explained, almost jovially. “You’re the serpent in our garden; you’ve brought some new cold viruses with you that we haven’t grown accustomed to as yet.”
Jamie felt miserable, more from the accusing stares his bleary-eyed comrades gave him whenever they sneezed than from his own stuffed head and wheezing chest.
Like the first week of school, he told himself. Everybody catches everything. Yet it made him feel more the outsider than ever before. Even after the colds ran their course and everyone returned to good health Jamie still kept mostly to himself, alone and unhappy-until he remembered that he was going to Mars.
4
Space and time are two aspects of the same thing, dimensions of the universe. There was a keyhole in spacetime, or as the engineers of mission control phrased it, a window. The two Mars craft had to be launched out of Earth orbit through that keyhole, through that window, at a certain time and in a precise direction with exactly the proper velocity, if they were to reach the moving pinpoint of light that was their destination.
For twenty-three days the two dozen men and women of the Mars mission, plus their expedition commander, Dr. Li, checked and re-checked every piece of equipment stowed aboard the long sleek Mars spacecraft. While they did so, specialist teams of technicians and robots attached bulky ovoid tanks of propellants around the aft end of each craft. The spacecraft began to look like thin white pencils surrounded by clusters of matte-gray lozenges at their eraser end.
The propellants had been manufactured on the moon and catapulted from the airless lunar surface to rendezvous with the spacecraft waiting in Earth orbit. The mission to Mars required not only Earth’s resources, but the mining and processing centers on the moon as well.
On the twenty-fourth day the Mars-bound personnel left the assembly station for good and transferred their personal gear to the spacecraft. Twelve men and women aboard the habitat module of Mars 1, twelve plus Dr. Li in Mars 2. No one made a single mention of the fact that there would be thirteen aboard Mars 2. None of the scientists or pilots would admit to being superstitious; still, no one spoke the word “thirteen.”
Space-suited technicians attached the long tethers that connected the two assembled spacecraft. Manufactured in the microgravity environment of a space station facility, the tethers had a tensile strength many times greater than that of any material that could be made on Earth.
Once they were on their way to Mars, tiny cold-gas thrusters would spurt in a precisely programmed order and the spacecraft would begin to spin up in a stately, graceful rotation. The tethers would stretch to their full five-kilometer length, and inside the connected Mars spacecraft a feeling of normal gravity would return, while the universe outside would start to revolve slowly past their observation ports.
A cluster of astronomical telescopes and high-energy radiation sensors was carefully placed at the midpoint of the long tethers, where they would be effectively weightless and could maintain precise pointing accuracy for the astronomers who would operate them remotely from Earth.
Other thrusters would later do-spin the spacecraft enough to reduce the internal gravity to the Martian level. By the time they arrived at Mars the explorers would be fully accustomed to the low Martian gravity. On the nine-month flight back home the spacecraft would spin up to a normal terrestrial g once again.
The interior of the habitat module was like the interior of every spacecraft Jamie had ever been in: a central corridor flanked either by the closed doors of privacy compartments or the open benches and equipment racks of workstations.
Up forward was the command section where a Russian cosmonaut and American astronaut copiloted the spacecraft. Just behind it was a sort of passenger compartment with seats for all the personnel, which could also serve as an informal lounge or conference room.
There was no need for acceleration couches. The rockets that would propel them to Mars produced very low levels of thrust; they would hardly feel as much acceleration as during a jet airliner’s takeoff. Lifting off from the ground and going into Earth orbit required a big jolt of thrust, several minutes of three g’s or more. That had all been done by space shuttles and unmanned rocket boosters carrying cargo. Once in orbit, though, the rest of the solar system could be reached gently.