“If you want adventure, you made a mistake exploring space. The only space adventures I’ve heard of are secondhand stories built on guesswork; the people who really had them weren’t around to tell about it. Unless Dr. Marini discovers a set of Mercurian monsters at the last minute and they invade the ship or cut off one of the tractors, I’m afraid you’ll have to do without adventures.” Zaino grimaced.
“That sounds funny coming from a spaceman, Captain. I didn’t really mean adventure, though; all I want is something to do besides betting whether the next quake will come in one minute or five. I haven’t even had to fix a suit-radio since we touched down. How about my going out with one of the tractors on this last trip, at least?”
“It’s all right with me,” replied Rowson, “but Dr. Mardikian runs the professional part of this operation. I require that Spurr, Trackman, Hargedon and Aiello go as drivers, since without them even a minor mechanical problem would be more than an adventure. As I recall it, Dr. Harmon, Dr. Schlossberg, Dr. Marini and Dr. Mardikian are scheduled to go; but if .any one of them is willing to let you take his or her place, I certainly don’t mind.”
The radioman looked around hopefully. The geologists and the biologist shook their heads negatively, firmly and unanimously; but the astronomer pondered for a moment. Zaino watched tensely.
“It may be all right,” Schlossberg said at last. “What I want to get is a set of wind, gas pressure, gas temperature and gas composition measures around the route. I didn’t expect to be more meteorologist than astronomer when we left Earth, and didn’t have exactly the right equipment. Hargedon and Aiello helped me improvise some, and this is the first chance to use it on Darkside. If you can learn what has to be done with it before starting time, though, you are welcome to my place.”
The communicator got to his feet fast enough to leave the deck in Mercury’s, feeble gravity.
“Lead me to it, Doc. I guess I can learn to read a homemade weathervane!”
“Is that merely bragging or a challenge?” drawled a voice which had not previously joined the discussion. Zaino flushed a bit.
“Sorry, Luigi,” he said hastily. “I didn’t mean it just that way. But I still think I can run the stuff.”
“Likely enough,” Aiello replied. “Remember though, it wasn’t made just for talking into.” Schlossberg, now on his feet, cut in quickly.
“Come on, Arnie. We’ll have to suit up to see the equipment; it’s outside.”
He shepherded the radioman to the hatch at one side of the deck and shooed him down toward the engine and air lock levels. Both were silent for some moments; but safely out of earshot of Deck Five the younger man looked up and spoke.
“You needn’t push, Doc. I wasn’t going to make anything of it. Luigi was right, and I asked for it.” The astronomer slowed a bit in his descent.
“I wasn’t really worried,” he replied, “but we have several months yet before we can get away from each other, and I don’t like talk that could set up grudges. Matter of fact, I’m even a little uneasy about having the girls along, though I’m no misogynist.”
“Girls? They’re not—”
“There goes your foot again. Even Harmon is about ten years older than you, I suppose. But they’re girls to me. What’s more important, they no doubt think of themselves as girls.”
“Even Dr. Burkett? That is—I mean—”
“Even Dr. Burkett. Here, get into your suit. And maybe you’d better take out the mike. It’ll be enough if you can listen for the next hour or two.” Zaino made no answer, suspecting with some justice that anything he said would be wrong.
Each made final checks on the other’s suit; then they descended one more level to the airlock. This occupied part of the same deck as the fusion plants, below the wings and reaction mass tanks but above the main engine. Its outer door was just barely big enough to admit a space-suited person. Even with the low air pressure carried by spaceships, a large door area meant large total force on jamb, hinges and locks. It opened onto a small balcony from which a ladder led to the ground. The two men paused on the balcony to look over the landscape.
This, hadn’t changed noticeably since the last time either had been out, though there might have been some small difference in the volcanic cones a couple of miles away to the northeast. The furrows down the sides of these, which looked as though they had been cut by water but were actually bone-dry ash slides, were always undergoing alteration as gas from below kept blowing fresh scoria fragments out of the craters.
The spines—steep, jagged fragments of rock which thrust upward from the plain beyond and to both sides of the cones—seemed dead as ever.
The level surface between the Albireo and the cones was more interesting. Mardikian and Schlossberg believed it to be a lava sheet dating from early in Mercury’s history, when more volatile substances still existed in the surface rocks to cut down their viscosity when molten. They supposed that much—perhaps most—of the surface around the “twilight” belt had been flooded by this very liquid lava, which had cooled to a smoother surface than most Earthly lava flows.
How long it had stayed cool they didn’t guess. But both men felt sure that Mercury must have periodic upheavals as heat accumulated inside it—heat coming not from radio-activity but from tidal energy. Mercury’s orbit is highly eccentric. At perihelion, tidal force tries to pull it apart along the planet-to-sun line, while at aphelion the tidal force is less and the little world’s own gravity tries to bring it back to a spherical shape: The real change in form is not great, but a large force working through even a small amount of distance can mean a good deal of energy.
If the energy can’t leak out—and Mercury’s rocks conduct heat no better than those of Earth—the temperature must rise.
Sooner or later, the men argued, deeply buried rock must fuse to magma. Its liquefaction would let the bulk of the planet give farther under tidal stress, so heat would be penetrated even faster. Eventually a girdle of magma would have to form far below the crust all around the twilight strip, where the tidal strain would be greatest. Sooner or later this would melt its way to the surface, giving the zone a period of intense volcanic activity and, incidentally, giving the planet a temporary atmosphere.
The idea was reasonable. It had, the astronomer admitted, been suggested long before to account for supposed vulcanism on the moon. It justified the careful examination that Schlossberg and Zaino gave the plain before they descended the ladder; for it made reasonable the occasional changes which were observed to occur in the pattern of cracks weaving over its surface.
No one was certain just how permanent the local surface was—though no one could really justify feeling safer on board the Albireo than outside on the lava. If anything really drastic happened, the ship would be no protection.
The sun, hanging just above the horizon slightly to the watcher’s right, cast long shadows which made the cracks stand out clearly; as far as either man could see, nothing had changed recently. They descended the ladder carefully—even the best designed space suits are somewhat vulnerable—and made their way to the spot where the tractors were parked.
A sheet-metal fence a dozen feet high and four times as long provided shade, which was more than a luxury this close to the sun. The tractors were parked in this shadow, and beside and between them were piles of equipment and specimens. The apparatus Schlossberg had devised was beside the tractor at the north end of the line, just inside the shaded area.