Green Mars - Kim Stanley Robinson [179]
• • •
It was getting to be late enough in the winter that even at 80° latitude the sun rose for an hour or two around noon, and during these brief intervals the shifting fogs glowed in tones pastel or metallic— on some days violet and rose and pink, on others copper and bronze and gold. And in all cases the delicate shades of color were captured and reflected by the frost on the ground, so that it looked sometimes as if they traversed a world made entirely of jewels, of amethysts, rubies, sapphires.
On other days the wind would roar, throwing a weight of frost that coated the rover, and gave the world a flowing, underwater look. In the brief hours of sunlight they worked at clearing the rover’s wheels, the sun in the fog like a patch of yellow lichen. Once, after one of these windstorms had cleared, the fog hood was gone as well, and the land to every horizon was a spectacular complexity of ice flowers. And over the northern horizon of this rumpled diamond field stood a tall dark cloud, pouring up into the sky from some source that appeared to be not far over the horizon.
They stopped and dug out one of Nadia’s little shelters. Nirgal stared out at the dark cloud and looked at the map. “I think it might be the Rayleigh mohole,” he said. “Coyote started up the robot excavators in that one, during that first trip I took with him. I wonder if something’s come of it.”
“I’ve got a little scout rover stashed in the garage here,” Nadia said. “You can take that over and have a look if you want. I’d go too but I need to get back to Gamete. I’m supposed to meet Ann there day after tomorrow. Apparently she’s heard about the congress, and wants to ask me some questions.”
Art expressed an interest in meeting Ann Clayborne; he had been impressed by a video about her he had seen on the flight to Mars. “It would be like meeting Jeremiah.”
Jackie said to Nirgal, “I’ll come with you.”
• • •
So they agreed to meet in Gamete, and Art and Nadia headed there directly in the big rover, while Nirgal took off with Jackie in Nadia’s scout car. The tall cloud still stood over the icescape ahead of them, a dense pillar of dark gray lobes, torn flat in the stratosphere, in different directions at different times. As they got closer, it seemed more and more certain that the cloud was pouring up out of the silent planet. And then as they rolled to the edge of one low scarp, they saw that the land in the distance was clear of ice, the ground as rocky as it would be in high summer, but blacker, a nearly pure black rock that was smoking from long orange fissures in its bulbous, pillowy surface. And just beyond the horizon, which here was six or seven kilometers off, the dark cloud was roiling up, like a mohole thermal cloud gone nova, the hot gaseous smoke exploding outward and then tumbling up hastily.
Jackie drove their car to the top of the highest hill in the region. From there they could see all the way to the source of the cloud, and it was just as Nirgal had guessed the moment he had seen it: the Rayleigh mohole was now a low hill, black except for its pattern of angry orange cracks. The cloud poured out of a hole in this hill, the smoke dark and dense and roiling. A tongue of rough black rock stretched downhill to the south, in their direction and then off to their right.
As they sat in the car, silently watching, a big part of the low black hill covering the mohole tipped over and broke apart, and liquid