"I know it's a great view, Tony, but you will have time for sightseeing later. Let's keep an eye on the control panels. You and I are covering for Charles and Helen, and we've got to make sure we don't miss anything," Bill scolded the rookie astronaut. Though they were thoroughly cross-trained in the years prior to the flight, neither had really expected to be flying to the Moon performing the duties of their missing colleagues in addition to their own.

"Roger that" was all Chow could muster in response. Bill made a mental note to keep an eye over Tony's shoulder for the time being until he was certain he was going to be good to go. Just another precautionary measure.

The second stage of the Ares I lifted the Orion capsule into a circular orbit just above two hundred and fifty miles high. At that point, the second-stage separation pyrotechnics fired, blasting the liquid hydrogen and oxygen tanks away and allowing them to fall back to Earth and burn up on reentry. All that was left of the Ares I was the Orion s.p.a.ces.h.i.+p and its two occupants. Thanks to the successful launch of the Ares V rocket, they were on track to rendezvous with the Earth Departure Stage carrying the lunar lander. After that, they would be on their way out of Earth orbit and moving toward the Moon.

Stetson had practiced the rendezvous with the lander several times in the last few days and thousands of times over the last few months. In about four orbits it would be showtime. Ignoring his own admonition, Stetson peered out the window to gaze on the beautiful blue planet beneath him. Scanning the surface to find a recognizable reference point, he quickly realized they were approaching the east coast of Africa and the Indian Ocean.

I never get tired of this, he thought to himself as he snapped out of his reverie and back into the reality of flying a s.p.a.cecraft traveling at five miles each second. At these speeds, errors could be fatal and unforgiving. And he could not forget the error that had occurred in this stage of the mission during the test flight. he thought to himself as he snapped out of his reverie and back into the reality of flying a s.p.a.cecraft traveling at five miles each second. At these speeds, errors could be fatal and unforgiving. And he could not forget the error that had occurred in this stage of the mission during the test flight.

Four orbits pa.s.sed a lot faster than Bill had expected. It seemed only moments ago that they were on the launchpad and now the LIDAR was beeping away at the Altair lander recently launched by the mighty Ares V rocket. NASA had come a long way from launching rockets separated in time by at least a month or more to doing it with only hours or days in between. Designing for relative simplicity had helped a lot.

"Houston, we have LIDAR confirmation that the range to target is twenty-five hundred meters and closing," Bill reported. "I am disengaging the automated rendezvous and docking system now."

"Mercy I, please repeat," said the monotone voice of the mission controller in faraway Houston, Texas. please repeat," said the monotone voice of the mission controller in faraway Houston, Texas.

"I said, I am disengaging the AR and D system and proceeding with a manual docking." Though choosing to turn off the automated rendezvous and docking system was within his purview as commander and pilot of the flight, it was still unusual to do so in the absence of any sort of in-flight anomaly or failure. To Stetson, the failure that had caused him to a.s.sume command of the rendezvous during the test flight was reason enough to take control now. Besides, what were they going to do about it? Abort and ask him to come home? Not likely.

"Roger that, Mercy I Mercy I. We understand that you are proceeding with a manual docking. There are some curious folks down here who want to know why. I'm sure you'll fill them in."

"Will do, Houston," Stetson confirmed.

"All right, Bill, show me how a real astronaut flies a s.p.a.ces.h.i.+p." Chow smiled, not at all worried that his colleague and friend might screw up as they moved around the Earth every ninety minutes or so, waiting to collide-dock-with the rest of their lunar-exploration vehicle.

"Just hold on, Tony. Help me keep an eye on that delta-vee," Bill replied matter-of-factly. "Two thousand meters to target," Bill said.

"Relative velocity one hundred meters per second," Chow told his pilot.

Stetson fired the forward thrusters to reduce the relative velocity between the vehicles. Stetson's actions were just like in the robotic mission weeks earlier, but this time there was no obvious failure. He had done it then, and, in his mind at least, he was sure to do it again. This was what Bill was born to do.

Stetson again fired the thrusters to slow the Orion. Like the previous firings, inside the capsule they heard the BANG BANG BANG BANG of the thrusters. The sound was loud and annoying, but also comforting. For Stetson, it was the sound of him being in control. And he liked being in control. of the thrusters. The sound was loud and annoying, but also comforting. For Stetson, it was the sound of him being in control. And he liked being in control.

"One hundred and fifty meters to target," Chow said.

"One hundred meters."

"Twenty-five meters."

They both felt the b.u.mp as the Orion successfully mated with the Altair, making Mercy I Mercy I a complete s.p.a.cecraft. To Stetson, the resulting silence was deafening. His adrenaline was still pumping. Beads of perspiration were evident on his brow, and his ground-based physician was certainly monitoring his now-declining heart rate. a complete s.p.a.cecraft. To Stetson, the resulting silence was deafening. His adrenaline was still pumping. Beads of perspiration were evident on his brow, and his ground-based physician was certainly monitoring his now-declining heart rate.

"Houston, this is Mercy I Mercy I. We're docked and beginning the Earth departure checklist." Stetson was not about to take a break or relax while lives on the Moon were depending upon him.

"Tony, pull up the Earth departure checklist and let's get started."

"Roger that." Chow smiled, himself not completely relaxed, and replied in his most professional voice for the benefit of all those listening to the exchange back on Earth.

Chapter 22.

A few orbits later, Stetson and Chow, with support from mission control in Houston, determined that all systems on Mercy I Mercy I were operational and ready for Trans-Lunar Injection, or TLI. It was at this point that the liquid-fueled engines of the Ares V Earth Departure Stage, or EDS, would reignite and give them the kick they needed to get to the Moon. Using essentially the same engines that powered the second stage of the Ares I, the Ares V EDS had fired first to place the vehicle and its payload into Earth orbit. Now that the rest of the s.p.a.ces.h.i.+p had arrived and docked, they were ready to be reignited. were operational and ready for Trans-Lunar Injection, or TLI. It was at this point that the liquid-fueled engines of the Ares V Earth Departure Stage, or EDS, would reignite and give them the kick they needed to get to the Moon. Using essentially the same engines that powered the second stage of the Ares I, the Ares V EDS had fired first to place the vehicle and its payload into Earth orbit. Now that the rest of the s.p.a.ces.h.i.+p had arrived and docked, they were ready to be reignited.

As with all phases of the mission so far, with the exception of the docking maneuver, the TLI was controlled by the onboard computer. Stetson and Chow watched with excitement and trepidation as the clock counted down to engine start. They were excited about their journey to the Moon but simultaneously worried at what they might find there. The Chinese crew was now experiencing the very cold lunar night, and no one could be sure there would be anyone left to rescue once Mercy I Mercy I arrived. arrived.

With only a few minutes to go before the engines were to ignite, Chow reached up and turned off the radio transmitter so as to keep cabin conversation from being broadcast home.

"Bill, have you thought about what we are going to do if we don't find anyone alive up there?"

"I try not to think about it. The Chinese amba.s.sador requested that we bring the bodies home. But I'm not sure that would be the right thing to do. I think, if they are dead, that we should bury them on the Moon. They knew the risks, and if it were me, I would want to have the Moon be my my final resting place. I'm not sure my wife would agree, but then again, she might. You?" final resting place. I'm not sure my wife would agree, but then again, she might. You?"

"I don't know. It's a shame we didn't have time to really plan for that contingency. I mean, if we bury them there, shouldn't they have some sort of marker or something?"

"Tony, these people are going to make it. We're going to get there, and we're going to get them home. No more of this dead and dying s.h.i.+t. We've got a rescue mission to make happen!"

"Right. I guess that's the only way to think about it until we get different data," Tony replied. "You got it." With that, he turned the cabin's transmitter back on.

The TLI burn was anticlimactic. Compared with launch and even the orbital-insertion burn, the boost that put them on a path to the Moon was fairly mild. The engines fired, changing the s.p.a.cecraft's roughly circular orbit around the Earth to an elliptical one with its highest point at the radius of the Moon's...o...b..t. If one were to look at the point in s.p.a.ce at which the s.p.a.cecraft would reach the Moon's...o...b..t at that very moment, then all that would be found would be empty s.p.a.ce. The Moon would not yet have arrived there in its own orbit about the Earth. The boost was timed so that the s.p.a.ces.h.i.+p would arrive at a point in s.p.a.ce at precisely the same time that the Moon would arrive, allowing them to rendezvous and then land. Orbital mechanics was all about where to arrive and when.

For the next few hours, Stetson and Chow performed various maintenance and preparatory jobs, finished their evening meal, and settled into their wall-mounted sleeping bags for a well-deserved night's rest. Neither felt the least little bit of s.p.a.ce sickness. Stetson had experienced it on his previous flights, with less severity on each subsequent flight. For this flight, he hardly noticed it. Chow appeared to be one of those rare people who was unaffected by s.p.a.ce sickness.

Chow struggled into his sleeping bag, taking comfort that the recirculating fans were humming in the background. He didn't want to fall asleep, have the fans fail, and suffocate on his own exhaled carbon dioxide. With no external forces or wind, it might be easy for an astronaut to suffocate during sleep, with a cloud of stationary carbon dioxide acc.u.mulating around his head. This, like many other "gotchas," was well understood by s.p.a.cecraft designers. Chow did manage to get this thought out of his mind as he fell into a fitful sleep.

Gazing out onto the gray lunar surface, Chow was stranded in the lunar lander, waiting to die. He was alone. In his thoughts he was asking, Where is Stetson? Why isn't he here? Where is Stetson? Why isn't he here? He knew that Bill had come to the Moon with him on the rescue mission, but he was nowhere to be found. He knew that Bill had come to the Moon with him on the rescue mission, but he was nowhere to be found. His panic began to increase until it finally reached a boiling point as he spoke to his wife, telling her goodbye from the Moon, when the alarm sounded and jolted him awake. His panic began to increase until it finally reached a boiling point as he spoke to his wife, telling her goodbye from the Moon, when the alarm sounded and jolted him awake.

Momentarily disoriented, Chow looked around, trying to figure out where he was. For a moment he thought he was, like in his dream, on the Moon. He then concluded that he must be at home in his bed-no, that wasn't right, either. Now fully awake, hearing the blaring of the klaxon, he realized he was on the Orion s.p.a.cecraft on his way to the Moon. He looked quickly over at Bill Stetson, who was also being jolted awake. Now fully awake, hearing the blaring of the klaxon, he realized he was on the Orion s.p.a.cecraft on his way to the Moon. He looked quickly over at Bill Stetson, who was also being jolted awake.

"Bill, what's going on?" he asked nervously.

"I have no idea." Stetson quickly unzipped his bag and didn't even bother to cover himself as he floated forward to check the status boards and find out why the alarm was sounding.

Chow unzipped and joined Stetson. Just as they arrived, the radio came to life.

"Mercy I, this is Houston. We're seeing a problem with one of your solar arrays. Are you seeing it as well?"

"Uh, checking it," Stetson relied. "Copy that, Houston-we see it. One appears to have stopped tracking the sun."

"That's what telemetry is showing us, over."

The solar arrays, mounted on the Orion near its base, provided most of the power required to run its systems. They were mounted on gimbals that allowed them to continuously track the sun so as to maintain the ability to generate a consistent amount of power. Since the Orion was moving toward the Moon while it was still orbiting the Earth, albeit on an ever-increasing alt.i.tude orbit, and since the whole s.p.a.cecraft was slowly spinning to equalize the heat input from the sun in its so-called barbeque roll, the solar arrays were constantly moving to keep the sun in view.

"Batteries are kicking in," noted Chow as he looked at the status board. With the array not pointing at the Sun, the power generated would drop, requiring the onboard batteries to come online in order to maintain the s.h.i.+p's systems, including life support.

"Houston, one of the arrays appears to have seized and is not moving," Stetson said. He looked at Chow and then back at the status screen.

Chow could see that Stetson was concerned. Without maximum power from the arrays, the s.h.i.+p would have to rely on batteries to make up the difference. There was enough power from the batteries to allow the craft to swing by the Moon and return to Earth-this was one of the contingencies that the Disaster Team had noted and required them to train for. The Disaster Team were the guys who looked at all the possible failures and then wrote training scenarios for the astronauts to practice and learn from. This was one of them.

The problem with letting this real-life problem be resolved as it was during training was that they would not have enough power to go into lunar orbit and land. Without landing they could not rescue the stranded Chinese taikonauts. If they followed the book, the mission would be over. They would survive, and all the Chinese would die.

Chow momentarily imagined himself as one of the Chinese taikonauts, stranded, cold, and waiting to die. It was too much like his dream, and he quickly shook himself away from the daydream and said, "Bill, we can't let this happen. We can't let those people die."

"d.a.m.n right we can't. But right now I sure don't know what we can do about it. While I come up with something, let's run the drill."

"Makes sense to me," Tony agreed.

"Houston. We're going to power down the array-control system and restart. I'm pulling up the reboot procedure now. Do you concur?"

"We concur. Reboot will take approximately twenty minutes. We'll be running the simulations in parallel. If we come up with something you need to know, we'll be in touch."

"Roger that. Mercy I Mercy I out." With that, Stetson began reviewing the manual restart procedure for the solar-array pointing system. out." With that, Stetson began reviewing the manual restart procedure for the solar-array pointing system.

Chow hadn't trained for this, so he decided it would be best to step back-float back, as it were-and let Bill do his job. He went to the window and looked out into s.p.a.ce. As the Orion spun, he caught sight of the Earth, which was still, by far, the largest object in view, and only fleeting glimpses of the Moon. He took a deep breath and waited.

Twenty minutes later, Chow watched Stetson complete the sequence that would completely power down the solar-array pointing system and then restart it. Anyone familiar with computers would have been in agreement with what he was trying to do-reboot.

Chow heard nothing to indicate that the reboot sequence was complete. He only heard his own breathing, some mumbled curses from Stetson, and a few status requests from the radio. He halfway expected to hear the sound of a large machine grinding to a halt and then restarting. Instead, there was just the silence of the crew compartment and the recirculating fans.

"d.a.m.n it!" Stetson said, pounding his fist against the console. The reacting force started him spinning in the opposite direction. He quickly stabilized himself with his other hand and planted a foot against his couch to hold him still. "Houston, the reboot is complete. No change. The array is not moving."

No sooner had those words left Stetson's lips than Chow's heart sank.

"We show the same on our boards down here, Bill. We're still looking at options."

Stetson pushed back from the console and floated to where Chow was perched.

"Tony, I have an idea. What if the gimbal just needs a good kick to get it moving again?"

"EVA?"

"Yes. I think I'm going to suit up, go out, and give it a kick. We've got to get it moving."

Stetson had that look that Tony recognized so well. It was that look that intimidated almost everyone who came into his presence. It was the get out of my way, I have something important to do get out of my way, I have something important to do look. And Chow didn't feel like getting in his way. He replied to his commander and friend, "I'll get the procedure pulled up, and then we'll get in our suits." Both men had to wear their suits, because the Orion didn't have an airlock. When the door opened to the vacuum of s.p.a.ce, all the air in the crew cabin would vent. That meant that everyone in the cabin had to wear their s.p.a.cesuits for an EVA, even if they weren't the ones going outside. look. And Chow didn't feel like getting in his way. He replied to his commander and friend, "I'll get the procedure pulled up, and then we'll get in our suits." Both men had to wear their suits, because the Orion didn't have an airlock. When the door opened to the vacuum of s.p.a.ce, all the air in the crew cabin would vent. That meant that everyone in the cabin had to wear their s.p.a.cesuits for an EVA, even if they weren't the ones going outside.

Chow learned in his very early training that getting into his s.p.a.cesuit wasn't like putting on a business suit. Each suit was specially designed or modified for a particular astronaut. Chow had his suit; Stetson had his own. The suits were kept aft and were at least readily accessible. Having only two people in a crew cabin designed to accommodate four was a plus-they had room to move around while they were getting their suits on.

Mission control had readily agreed with Stetson's EVA plan, though they didn't give the plan much chance of success. Some engineer quoted a thirty-five percent probability of success during the discussion, and Chow had to wonder how in the world they had come up with such a number. He thought to himself, Why isn't it thirty percent? Or forty percent? Why thirty-five? Why isn't it thirty percent? Or forty percent? Why thirty-five? And then he concluded that they really didn't know. The engineer was just quoting some computer model that he probably didn't really understand anyway. And then he concluded that they really didn't know. The engineer was just quoting some computer model that he probably didn't really understand anyway.

Forty minutes later, Stetson and Chow were suited up and ready to begin the EVA. Both men had checked and rechecked each other's suits, all according to procedure, and had "safed" any loose materials within the Orion. Once the atmosphere was removed from the Orion, Stetson would be able to open the door and begin his EVA. The last thing they wanted was for some vital piece of hardware to float out the door with him.

"Tony, we're down to minimum atmospheric pressure, and I am about to open the door. Are you ready?"

"I'm ready. I'll be here watching on the monitor. Just call if you need me."

"That's good to know." Stetson smiled. "But I think this'll be quick and easy. I should be back inside in just a few minutes."

With that, he reached down and forcefully pulled the door release, opening the cabin to s.p.a.ce. Without so much as a swoosh, the door opened and both men were exposed to the vacuum. Glancing briefly back at Chow, Stetson pushed and gently eased himself out the door. Once his arms cleared the hatch, he attached the loose end of the tether from his s.p.a.cesuit to the requisite attachment fitting on the hull of the s.h.i.+p. The tether would keep him from accidentally pus.h.i.+ng off from the s.h.i.+p too forcefully and floating away into s.p.a.ce.

Take it easy, Stetson told himself as he felt the rea.s.suring snap of the tether to the fitting. Though the craft was traveling toward the Moon at over twenty thousand miles per hour, the motion was simply un.o.bservable by Stetson as he began his s.p.a.cewalk. Without a reference point, such as the ground whizzing by beneath him, and without any of the other side effects of rapid motion such as the wind caused by moving through it, his senses told him that he and the Stetson told himself as he felt the rea.s.suring snap of the tether to the fitting. Though the craft was traveling toward the Moon at over twenty thousand miles per hour, the motion was simply un.o.bservable by Stetson as he began his s.p.a.cewalk. Without a reference point, such as the ground whizzing by beneath him, and without any of the other side effects of rapid motion such as the wind caused by moving through it, his senses told him that he and the Mercy I Mercy I craft were motionless in s.p.a.ce. He could, however, directly sense the s.h.i.+p's rotation. With the starfield, sun, and Earth rotating around his field of view, he knew that the s.h.i.+p was spinning. craft were motionless in s.p.a.ce. He could, however, directly sense the s.h.i.+p's rotation. With the starfield, sun, and Earth rotating around his field of view, he knew that the s.h.i.+p was spinning.

For a brief moment, he experienced a powerful sense of vertigo.

"It's so vast," Stetson said to no one in particular. With only his hand-sewn s.p.a.cesuit between him and infinity, he continued pulling himself out of the Orion until he was totally exposed.

"I'm moving aft toward the arrays. I can see them clearly. One is at a dead stop," Stetson said.

Using the handholds placed on the Orion for just this type of contingency, Stetson pulled himself toward the malfunctioning array. As he got closer, he marveled at their scale. Unfurled to collect sunlight and extended outward from the s.h.i.+p on booms, they were simply beautiful. Each of the two arrays was also eighteen feet in diameter. Huge. As the sun rotated into a more direct view, the reflected light from the arrays varied in brightness, looking like a lighthouse beacon. Stetson was glad he had a sun visor built into the helmet. The sun was bright bright.

Breathing deeply now, Stetson could clearly see his objective. The gimbal at the base of the array boom was the most likely culprit. Putting hand over hand, Stetson moved closer until he was finally able to reach out and touch the malfunctioning piece of hardware.

"Tony, I don't see any sign of damage. It looks just like it did in the mockup and on the drawings." He inspected the gimbal motor so closely that he nearly touched it with his visor.

"Roger that, Bill," Chow responded from within the confines of the Orion. "Move your head to the right so I can get a better look." Chow was referring to the helmet camera built into each astronaut's s.p.a.cesuit.

Stetson tilted his head, altering his vantage point so that the gimbal would no longer be quite as shadowed, giving his comrade a better view.

"Thanks. I can see it now. I've got the image on-screen next to the as-built image, and they look the same. No damage that I can tell, either."

"Roger that. I guess I'll see if I can kick it loose." Stetson was speaking figuratively. He had no intention of actually kicking the array. Instead, he looked for a convenient place to grab on to it, and then he began slowly twisting the boom, searching for a way to get it moving again. He encountered resistance. The boom didn't move.

Twisting harder in the clockwise direction, Stetson's entire body began to pivot counterclockwise, causing Stetson to momentarily lose his sense of balance just like before when he had pounded his fist against the console. He laughed to himself and said, "Newton got me. Hold on."

With that, he readjusted himself so as to get better footing on the handrail, wedging his boots to better anchor himself into position. Once he was satisfied that he wouldn't torque himself instead of the boom, he grasped the boom and tried again. Still nothing. This time he didn't slip, nor did he laugh.

After about ten minutes of twisting and turning without any success, he paused.

"Bill? May I make a suggestion?" Tony asked.

"Sure, go ahead," Stetson replied.

"Why don't I do another reboot while you are trying to work it loose? Maybe while the control system is not actively applying power to the gimbal's motor, you can get it to move. It might be locked in place electromechanically. If so, you'd be pus.h.i.+ng against not only the gimbal, but the motor driving it."

"Great idea, Tony. Let's give it a try."

"On it."

Since Chow had never done the reboot, not even in training, it took him a little longer than it had taken Stetson.

While he was waiting, Stetson had time to contemplate the mission and where he was. He decided that no one, other than another astronaut, could even come close to understanding the emotions and feelings that one experienced in a s.p.a.cesuit traveling through s.p.a.ce. G.o.d, I was meant for this. G.o.d, I was meant for this. Stetson said this to himself, not really to G.o.d. Stetson said this to himself, not really to G.o.d. My whole life led to this trip, and I love it. My whole life led to this trip, and I love it.

He was shaken from his reverie by Chow's voice on the speaker. "Bill, I'm ready. Are you?"

"Yes. I'll start flexing as soon as you cut the power and start the reboot sequence," Stetson replied.

"Okay. Here we go."

A few seconds pa.s.sed, and then Chow's voice returned. "Now. The power is cycled down and getting ready to restart."