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 Commonwealth was expanding steadily. It would be a matter of only a few centuries until a wormhole was opened to the Dyson Pair. Any lingering questions about their construction could be answered then by the aliens themselves.

Now he’d seen that the envelopment was instantaneous, Dudley was left with a whole new set of very uncomfortable questions about the composition of the shell structure. An eight-year construction period for any solid shell that size had been assessed as remarkable, but obviously achievable. When he’d begun the observation he’d expected to note a year-by-year eclipse of the star’s light as more and more segments were produced and locked into place. This changed everything. To appear so abruptly, the shell couldn’t be solid. It had to be some kind of force field. Why would anyone surround a star with a force field?

“Are we recording?” he asked his e-butler.

“We are not,” the e-butler replied. “No electronic sensors are currently active at the telescope focus.” The voice was slightly thin, treble-boosted; a tone that had been getting worse over the last few years. Dudley suspected the OC tattoo on his ear was starting to degenerate; organic circuitry was always susceptible to antibody attack, and his was over twenty-five years old. Not that the glittery scarlet and turquoise spiral on his skin had changed. A classic spree of youthful dynamism after his last rejuvenation had made him choose a visible pattern, stylish and chic in those days. Now it was rather embarrassing for a middle-aged professor to sport around the campus. He should have had the old pattern erased and replaced it with something more discreet; but somehow he’d never gotten around to it, despite his wife’s repeated requests.