Ramiro clutched his abdomen and moved away slowly, but once he was out of sight he broke into a run. He’d planned the detour carefully, and with the air calm it was easy to navigate by the stars. Stones and sand fled from his feet, and sought them; he’d thought he’d grown used to that, but the speed made it stranger. His gait seemed at once more precarious and more certain; it was as if he were watching a recording of himself performing a difficult balancing act, while knowing for a fact that he hadn’t actually toppled over.

Even by starlight, the probe’s truncated cone stood out sharply from the haphazard shapes of the rocks around it. Ramiro paused to orient himself carefully before squatting down and embracing the thing. Just spending so much time in Esilio’s gravity must have left him stronger than he had been by the standards of the mountain, but on balance the penalty it added now felt like more than enough to wipe out that advantage. He waddled across the valley floor, muttering curses, forcing himself to continue for a count of three gross steps before resting.

No one had come this way since the last of the original test plots had died off, and no one would have reason to do so again. If he could leave the probe unseen a short walk from the Surveyor, it would give him a chance to revisit the blast site while pretending to be retrieving the thing. That retrieval had never been part of the mission plan, but he couldn’t see anyone objecting to his desire to scrutinise the probe’s materials in the aftermath of its peculiar heating. They were all going to need their projects to help pass the time on the long journey back.

As Ramiro hefted the probe again, an amused voice in the back of his head demanded: Why go to so much trouble? If he abandoned the whole frantic scheme right now, what exactly would that change? He’d be able to look Greta in the eye and tell her honestly that he’d had nothing to do with the inscription. The true author of the words would turn out to be a settler playing along as a kind of bitter joke, or a genuine visitor from the home world six generations hence. In either case, how would he be worse off?

His arms were beginning to ache; he lowered the probe to the ground.

What he’d feared the messaging system would impose on him was an endless plateau of least resistance: every decision he learnt that he would make would strike him as acceptable – never entirely out of character, never deeply morally repugnant – but it would still be less his own than if he’d been left to ruminate on the matter without the deadening intervention of foreknowledge.