Yalda stopped walking. They were halfway across the bridge, supported by a slender arch of stonework over the blackness of the crevasse. She felt a shudder pass through the skin of her back; she’d just had an eerie sense of knowing what her shy, intense new colleague would say next.
“When our descendants turn around and travel back in time,” Benedetta wondered, “will they still have the luxury we have, of debating this in the abstract? Once past and future are no longer so clear, will they still have the choice to go on seeing things the old way?”
Eusebio counted, “Three. Two. One.”
A distant line of light split the sky, wavering in the heat haze. A pause later the bunker trembled; as the timber boards holding back the sand flexed and rattled, the air filled with fine dust. Yalda and her companions were lying flat on their backs, a stride beneath the ground, but the tilted mirror above let them watch the ascending rocket as if they were upright in the desert, while the tinted clearstone pane protected them from the glare.
Yalda was prepared for the hiss when it came, but not the crack that abruptly bisected the pane along a jagged diagonal. She reached up to support the two pieces before they could slip from the frame and decapitate someone.
Amando cursed quietly and raised his own hands to help; Eusebio did the same, exchanging a glance with Yalda expressing relief that it hadn’t been worse. They’d isolated both the mirror and the pane from ground vibrations, but the shock wave in the air had still been enough to do damage. Nereo didn’t flinch; he was still tracking the rocket with his theodolite, and probably hadn’t even noticed the crack.
Giulio, the journalist from Red Towers, turned to Eusebio chirping with excitement. “To be honest with you, I thought it would just explode on the ground. But it’s really up there!” He was too overwhelmed by the spectacle of the launch to care that he’d narrowly avoided being sliced in two by a giant stone blade.
“That’s what rockets do,” Eusebio replied modestly. “Ascend.”
“When does it fall down again?” Giulio asked.
“This one won’t,” Eusebio predicted.
Yalda wasn’t so sure. Through the protective filter the rocket had almost dimmed to invisibility; Eusebio would have gauged its progress by eye, but it would take the precise measurements of their independent observer to confirm its ultimate destination.
Giulio raised his head so he could peer over the intervening bodies and see what Nereo was up to. Nereo was propped up on a special bench that Amando had constructed; this allowed him to watch a clock with his rear gaze at the same time as he followed the rocket through the theodolite. Yalda could see a list of pairs of times and angles written along the length of Nereo’s right arm; as she watched, he added one more pair then looked away from the theodolite and began producing further columns of numbers. The rocket would still be burning fuel—so there was still a chance that it could lose stability and drive itself back toward the ground—but on the assumption that it would do no worse, now, than if it had simply cut off its engines at the last clear observation, Nereo could give a tentative verdict on its fate.
“It’s escaped the world’s gravity,” Nereo declared. “I suspect it’s heading for an eccentric orbit around the sun with a period of several dozen years.”
“How can it have escaped?” Giulio asked. “Are you saying it’s already reached a height where gravity’s negligible?”
His tone of incredulity was appropriate, but he’d missed the point. Nereo said, “At the altitude it had reached on my last observation, gravity is barely diminished—but it was already moving rapidly enough to guarantee that it would never be brought to a halt. Not by the world—though the sun still had hold of it.”
Yalda looked to Amando, and together they managed to slide the tinted pane aside without the pieces falling on them. The bunker’s five occupants climbed to their feet and scrambled up onto the sand, slipping between the ground and the mirror.
Yalda searched the sky, high to the east. There weren’t many Hurtlers today to confuse the view, and she could see a faint gray speck that could only be Eusebio’s house-sized pillar of rock—engines still blazing, still gaining speed. The escape velocity for the sun itself was only three times greater than the world’s. Given the results from earlier yield experiments, if the rocket burned all its fuel without mishap it could actually end up leaving the solar system.
Giulio addressed Eusebio. “You should come to Red Towers and talk about your plans. Nereo’s already given public lectures on rotational physics, so the ideas aren’t completely new to people, but I can run some articles in the Report beforehand to help your audiences prepare.”
Yalda wondered what was in the crops around Red Towers that was missing from Zeugma’s diet.
Eusebio said, “I’d be delighted.”
Yalda thanked Nereo for his participation. “It’s a pleasure,” he said. “I don’t know if your guess about the Hurtlers is right, but I’m glad someone’s thinking about these possibilities.”
“I can’t interest you in a place on the rocket?”
Nereo buzzed with mirth. “I’d rather stay safe on the ground, and wait for your dozen-fold-great-grandchildren to tell me all the marvelous science they’ve discovered.”
Yalda said, “I get that answer a lot.”
She wished she could have spent longer with Nereo, but he and Giulio needed to get back to Red Towers. Amando brought one of the trucks out of the shed and sped off across the desert with their guests.
Eusebio turned to Yalda. “Will you come to Red Towers with me? Tour the show?”
“If I can get leave from the university.” Yalda hesitated. “Do you think you could pay me a small fee for that?”
“Of course.” Eusebio had invited her several times to become an employee, but so far she’d resisted; she’d wanted to retain her independence, in order to be able to speak her mind to him freely.
She added apologetically, “If I’m not teaching I won’t get paid, and it’s not fair on Lidia and Daria to be looking after the children with no help.”
“Hmm.” Eusebio had already made it clear that he disapproved of what the three of them were doing: women—however capable they could be in other spheres—had not been shaped by nature for the raising of children. There were plenty of widowers in Zeugma desperate for heirs, and prepared to treat them like the flesh of their own co.
But he had more important things to think about than the flaws in Yalda’s domestic life. “Beyond spreading the news to the citizenry of Red Towers,” he said, “I’m hoping your colleague Nereo can arrange a meeting for me with his patron.”
“You can’t get an introduction to Paolo yourself?” Yalda was amused. “Whatever happened to the plutocrats’ network?”
“Networks, plural. They’re not all joined together.”
“Why do you want to meet Paolo?”
“Money,” Eusebio replied bluntly. “My father’s set a ceiling on my investment in the rocket. If I’m going to have to build the whole structure myself—mining and transporting all the sunstone, incorporating it into an artificial shell… if I tried to match the scale of Mount Peerless the costs would be greater by a factor of several gross, but even the smallest viable alternative is far beyond what I can afford on my own.”
“Have you thought of bribing all the people who are entitled to vote on the observatory?” Yalda suggested. “Not just with a shiny new telescope—with money they can put in their own pockets?”
Eusebio was insulted. “I’m not a fool; that was my very first plan. But Acilio has the Council scrutinizing the University’s business very closely, and he has so many spies in the University himself that I doubt I could get away with that kind of thing.”