Pandora's Star

ONE The star vanished from the center of the telescope's image in less time than a single human heartbeat. There was no mistake, Dudley Bose was looking right at it when it happened. He blinked in surprise, drawing back from the eyepiece. "That's not right," he muttered. He shivered slightly in reaction to the cold air around him, slapping gloved hands against his arms. His wife, Wendy, had insisted he wrap up well against the night, and he'd dutifully left the house in a thick woolen coat and sturdy hiking trousers. As always when the sun fell below Gralmond's horizon, any warmth in the planet's thinner-than-average atmosphere dissipated almost immediately. With the telescope housing open to the elements at two o'clock in the morning, the temperature had dropped enough to turn his every breath into a stream of gray mist. Dudley shook the fatigue from his head, and leaned back into the eyepiece. The starfield pattern was the samethere had been no slippage in the telescope's alignmentbut Dyson Alpha was still missing. "It couldn't be that fast," he said. He'd been observing the Dyson Pair for fourteen months now, searching for the first clues of the envelopment that would so dramatically alter the emission spectrum. Until tonight there had been no change to the tiny yellow speck of light twelve hundred forty light-years away from Gralmond that was Dyson Alpha. He'd known there would be a change; it was the astronomy department at Oxford University back on Earth that had first noticed the anomoly during a routine sky scan back in 2170, two hundred and ten years ago. Since the previous scan twenty years earlier, two stars, a K-type and an M-type three years apart, had changed their emission spectrum completely to nonvisible infrared. For a few brief months the discovery had caused some excited debate among the remnants of the astronomy fraternity about how they could decay into red giants so quickly, and the extraordinary coincidence of two stellar neighbors doing so simultaneously. Then a newly settled planet fifty light-years farther out from Earth reported that the pair were still visible in their original spectrum. Working back across the distance, checking the spectrum at various distances from Earth, allowed astronomers to work out that the change to both stars had occurred over a period of approximately seven or eight years. Given that amount of time, the nature of the change ceased to become a question of astronomy; stars of that category took a great deal longer to transform into red giants. Their emission hadn't changed due to any natural stellar process; it was the direct result of technological intervention on the grandest possible scale. Somebody had built a solid shell around each star. It was a feat whose scale was rivaled only by its time frame. Eight years was astonishingly swift to fabricate such a gigantic structure, and this advanced civilization had apparently built two at the same time. Even so, the concept wasn't entirely new to the human race. In the twenty-first century, a physicist named Freeman Dyson had postulated that the artifacts of a technologically advanced civilization would ultimately surround their star in order to utilize all of its energy. Now someone had turned his ancient hypothesis into reality. It was inevitable that the two stars would be formally christened the Dyson Pair. Speculative papers were written after the Oxford announcement, and theoretical studies performed into how to dismantle Jovian-size planets to produce such a shell. But there was no real urgency connected to the discovery. The human race had already encountered several sentient alien species, all of them reassuringly harmless; and the Intersolar CommonHamilton, Peter F. is the author of 'Pandora's Star', published 0008 under ISBN 9780345461629 and ISBN 0345461622.