It was too much to grasp. It kept slipping out of his mind, then reoccurring to him, and surprised by joy he would exclaim, “Ha! Ha!” The taste of tomato soup and bread; “Ha!” The dusky purple of the twilight sky; “Ha!” The spectacle of the dashboard instrumentation, glowing faintly, reflected in the black windows; “Ha! Ha! Ha! My-oh-my.” He could drive anywhere he wanted to. No one told them what to do. He said that aloud to his darkened AI screen: “No one tells us what to do!” It was almost frightening. Vertiginous. Ka, the yonsei would say. Ka, supposedly the little red people’s name for Mars, from the Japanese ka, meaning fire. The same word existed in several other early languages as well, including proto-Indo-European; or so the linguists said.
Carefully he got in the big bed at the back of the compartment, in the hum of the rover’s heating and electrical system, and he lay humming to himself under the thick coverlet that caught up his body’s heat so fast, and put his head on the pillow and looked out at the stars.
• • •
The next morning a high-pressure system came in from the northwest, and the temperature rose to 262 K. He had driven down to five kilometers above the datum, and the exterior air pressure was 230 millibars. Not quite enough to breathe freely, so he pulled on one of the heated surface suits, then slipped a small air tank over his shoulders, and put its mask over his nose and mouth, and a pair of goggles over his eyes.
Even so, when he climbed out of the outer-lock door and down the steps to the sand, the intense cold caused him to sniffle and tear up, to the point of impeding his vision. The whistle of the wind was loud, though his ears were inside the hood of his suit. The suit’s heater was up to the task, however, and with the rest of him warm, his face slowly got used to it.
He tightened the hood’s drawstring and walked over the land. He stepped from flat stone to flat stone; here they were everywhere. He crouched often to inspect cracks, finding lichen and widely scattered specimens of other life: mosses, little tufts of sedge, grass. It was very windy. Exceptionally hard gusts slapped him four or five times a minute, with a steady gale between. This was a windy place much of the time, no doubt, with the atmosphere sliding south around the bulk of Tharsis in massed quantities. High-pressure cells would dump a lot of their moisture at the start of this rise, on the western side; indeed at this moment the horizon to the west was obscured by a flat sea of cloud, merging with the land in the far distance, out there two or three kilometers lower in elevation, and perhaps sixty kilometers away.
Underfoot there were only bits of snow, filling some of the shaded crack systems and hollows. These snowbanks were so hard that he could jump up and down on them without leaving a mark. Windslab, partially melted and then refrozen. One scalloped slab cracked under his boots, and he found it was several centimeters thick. Under that it was powder, or granules. His fingers were cold, despite his heated gloves.
He stood again and wandered, mapless over the rock. Some of the deeper hollows contained ice pools. Around midday he descended into one of these and ate his lunch by the ice pool, lifting the air mask to take bites out of a grain-and-honey bar. Elevation 4.5 kilometers above the datum; air pressure 267 millibars. A high-pressure system indeed. The sun was low in the northern sky, a bright dot surrounded by pewter.
The ice of the pool was clear in places, like little windows giving him a view of the black bottom. Elsewhere it was bubbled or cracked, or white with rime. The bank he sat on was a curve of gravel, with patches of brown soil and black dead vegetation lying on it in a miniature berm— the high-water mark of the pond, apparently, a soil shore above the gravel one. The whole beach was no more than four meters long, one wide. The fine gravel was an umber color, piebald umber or. . . . He would have to consult a color chart. But not now.
The soil berm was dotted by pale green rosettes of tiny grass blades. Longer blades stood in clumps here and there. Most of the taller blades were dead, and light gray. Right next to the pond were patches of dark green succulent leaves, dark red at their edges. Where the green shaded into red was a color he couldn’t name, a dark lustrous brown stuffed somehow with both its constituent colors. He would have to call up a color chart soon, it seemed; lately when looking around outdoors he found that a color chart came in handy about once a minute. Waxy almost-white flowers were tucked under some of these bicolored leaves. Farther on lay some tangles, red-stalked, green-needled, like beached seaweed in miniature. Again that intermixture of red and green, right there in nature staring at him.
A distant wind-washed hum; perhaps the harping rocks, perhaps the buzz of insects. Black midges, bees . . . in this air they would only have to sustain about thirty millibars of CO2, because there was so little partial pressure driving it into them, and at some point internal saturation was enough to hold any more out. For mammals that might not work so well. But they might be able to sustain twenty millibars, and with plant life flourishing all over the planet’s lower elevations, CO2 levels might drop to twenty millibars fairly soon; and then they could dispense with the air tanks and the face masks. Set loose animals on Mars.