Энди Вейр - The Martian

“So tell me about the MDV.”

“JPL strips it down, loses some weight, and adds some fuel tanks. Ares 4’s crew lands at the Ares 3 site, very efficiently. Then, with a full burn, and I mean a full burn, they can lift off again. It can’t get back to orbit, but it can go to the Ares 4 site on a lateral trajectory that’s, well, really scary. Then they have an MAV. This would require a massive design and construction effort, but JPL says they can make it happen.”

“How are they losing weight?” Teddy asked. “Don’t they already have it as light as it can be?”

“By removing safety and emergency equipment.”

“Wonderful,” Teddy said, “So we’d be risking the lives of six more people in a very dangerous landing, re-liftoff, re-landing process.”

“Yup,” Venkat said. “It would be safer to leave the Ares 4 crew in Hermes, and only send the pilot down with the MDV. But that would mean giving up the mission and they’d rather risk death.”

“They’re astronauts,” Teddy said.

“They’re astronauts,” Venkat confirmed.

“Well. That’s a ludicrous idea and I’ll never ok it.”

“We’ll work on it some more,” Venkat said. “Try to make it safer.”

“Do that. Any idea how to keep him alive for four years?”

“Nope.”

“Work on that, too.”

“Will do,” Venkat said.

Teddy swiveled his chair and looked out the window to the sky beyond. Night was edging in. “What must it be like?” He pondered. “He’s stuck out there. He thinks he’s totally alone and that we all gave up on him. What kind of effect does that have on a man’s psychology?”

He turned back to Venkat. “I wonder what he’s thinking right now.”

How come Aquaman can control whales? They’re mammals! Makes no sense.

I finished making water some time ago. I’m no longer in danger of blowing myself up. The potatoes are growing nicely. Nothing has conspired to kill me in weeks. And ‘70’s TV keeps me disturbingly more entertained than it should. Things are stable here on Mars.

It’s time to start thinking long term.

Even if I find a way to tell NASA I’m alive, there’s no guarantee they’ll be able to save me. I need to be proactive. I need to figure out how to get to Ares 4.

Won’t be easy.

Ares 4 will be landing at the Schiaparelli Crater, 3,200km away. In fact, their MAV is already there. I know because I watched Martinez land it.

It takes 18 months for the MAV to make its fuel, so it’s the first thing NASA sends along. Sending it 48 months early gives it plenty of extra time in case fuel reactions go slower than expected. But much more importantly, it means a precision soft-landing can be done remotely by a pilot in orbit. Direct remote operation from Houston isn’t an option; they’re anywhere from 4 to 20 light-minutes away.

Ares 4’s MAV spent 11 months getting to Mars. Using less fuel and taking a longer route, it got there around the same time as us. As expected, Martinez landed it beautifully. It was one of the last things we did before piling in to our MDV and heading to the surface. Ahh, the good old days, when I had a crew with me.

I’m lucky. 3,200km isn’t that bad. It could have been up to 10,000km away. And because I’m on the flattest part of Mars, the first 650km is nice, smooth terrain (Yay Acidalia Planitia!) but the rest of it is nasty, rugged, crater-pocked hell.

Obviously, I’ll have to use a rover. And guess what? They weren’t designed for massive overland journeys.

This is going to be a research effort, with a bunch of experimentation. I’ll have to become my own little NASA, figuring out how to explore far from the Hab. The good news is I have lots of time to figure it out. Almost 4 years.

Some stuff is obvious. I’ll need to use a rover. It’ll take a long time, so I’ll need to bring supplies. I’ll need to recharge en-route, and rovers don’t have solar cells. I’ll need to steal some from the Hab’s solar farm. During the trip I’ll need to breathe, eat, and drink.

Lucky for me, the tech specs for everything are right here in the computer.

I’ll need to trick out a rover. Basically it’ll have to be a mobile Hab. I’ll pick Rover 2 as my target. We have a certain bond, after I spent two days in it during the “Great Hydrogen Scare of Sol 37.”

There’s too much shit to think about all at once. So for now, I’ll just think about power.

Our mission had a 10km operational radius. Knowing we wouldn’t take straight-line paths, NASA designed the rovers to go 35km on a full charge. That presumes flat, reasonable terrain. Each rover has a 9000Wh battery.

Step one is to loot Rover 1’s battery and install it in Rover 2. Ta-daa! I just doubled my full-charge range.

There’s just one complication. Heating.

Part of the battery power goes to heating the rover. Mars is really cold. Normally, we were expected to do all EVAs in under 5 hours. But I’ll be living in it 24½ hours a day. According to the specs, the heating equipment soaks up 400W. Keeping it on would eat up 9800Wh per day. Over half my power supply, every day!

But I do have a free source of heat: Me. A couple million years of evolution gave me “warm blooded” technology. I can wear layers. The rover has good insulation, too. It’ll have to be enough; I need every bit of power.

And because I need to bundle up anyway, I can deactivate the heater outright and use all the power for motion (minus a negligible amount for computer, life support, etc.)

According to my boring math, moving the rover eats 200Wh of juice to go 1km, so using the full 18,000Wh gets me 90km of travel. Now we’re talkin’.

I’ll never actually get 90km on a single charge. I’ll have hills to deal with, and rough terrain, sand, etc. But it’s a good ballpark. It tells me that it would take at least 35 days of travel to get to Ares 4. It’ll probably be more like 50. But that’s plausible, at least.

At the rover’s blazing 25kph top speed, it’ll take me 3½ hours before I run the battery down. I’d like to charge the battery up during the rest of the day. I can drive in twilight, and save the sunny part of the day for charging. This time of year I get about 13 hours of light. How many solar cells will I have to pilfer from the Hab’s farm?

Thanks to the fine taxpayers of America, I have over 100 of square meters of the most expensive solar paneling ever made. It has an astounding 10.2% efficiency, which is good because Mars doesn’t get as much sunlight as Earth. Only 500 to 700 watts per square meter (Compared to the 1400 those spoiled Earthlings get).

Long story short: I need to bring 28 square meters of solar cell. That’s 14 panels.

I can put two stacks of 7 on the roof. They’ll stick out over the edges, but as long as they’re secure I’m happy. Every day, after driving, I’ll spread them out then… wait all day. Man it’ll be dull.

Well it’s a start. Tomorrow’s mission: transfer Rover 1’s battery to Rover 2.

Sometimes things are easy, and sometimes they’re not. Getting the battery out of Rover 1 was easy. I removed two clamps on the undercarriage and it dropped right out. The cabling is easy to detach, too. It’s just a couple of complicated plugs.

Attaching it to Rover 2, however, is another story. There’s nowhere to put it!

The things is huge . I was barely able to drag it. And that’s in Mars gravity.

It’s just too big. There’s no room in the undercarriage for a second one. There’s no room on the roof, either. That’s where the solar cells will go. There’s no room inside the cabin, and it wouldn’t fit through the airlock anyway.