Dr. Ysolde Maren Pitch (Human, Eden Space Habitat Chief Scientist)

Two years had changed the shape of the room without changing anything the room actually decided. The monitoring officer who used to stand at the docking ring taking notes nobody read now had two colleagues doing the same thing, which was what twelve new compliance requirements had bought Eden instead of a policy: more people present for an event none of them had the authority to alter.

What had changed, Pitch was slowly coming to understand, was her own model's standing. Not authorised — nothing about it had ever been authorised — but cited now, quietly, in briefings she wasn't invited to, by people who had never once asked her whether the citation matched what she was actually prepared to claim.

Okafor had asked to see her before departure, which was more than Kilbride had done two years ago, and Pitch had taken that as a good sign until the conversation itself corrected her.

"You've read the transit data," Pitch said. "Both directions, the full instrument log, everything the committee's still sitting on."

"I've read it more than once." Okafor did not say this the way a nervous person says it. She said it the way a confident one does, and confidence was exactly what Pitch had come here worried about. "The corridor's stable, predictable, repeatable. Your model called all three properties two years in advance of anyone confirming them. I'm not walking in blind, Doctor. I'm walking in with the best data anyone's ever had for a transit like this."

"You're walking in with the best data anyone's ever had for the transit," Pitch said. "That's a smaller sentence than the one you just said, and I need you to hear the difference before you're the one aboard the ship instead of me. My model describes what happens between here and the terminus. It has never once described what's waiting at the terminus, because nothing has ever gone far enough to measure it. Constant Margin turned around at the threshold. You're not turning around at the threshold. That's not the same expedition wearing a bigger crew."

Okafor did not look impatient, which somehow made it worse. She looked like someone being patient with a colleague she respected and still intended to overrule. "Everything you predicted about the corridor has held. I understand that isn't a guarantee about what's past it. I've read your caveats, Doctor — they're in the analysis, page one hundred and ninety, I can quote them. I'm telling you I've read them and I'm still going. Those are different objections and I don't think you actually disagree with which one I'm raising."

Pitch didn't. That was the trouble with having trained her own replacement without meaning to: Okafor had absorbed the caveats perfectly and filed them exactly where confidence keeps caveats it has already decided not to be governed by.

"Then I'll say the rest of it plainly, since apparently that's still allowed here," Pitch said. "If the corridor is the only thing tested, the corridor is the only thing I can stand behind. I can't tell you the terminus is safe. I can only tell you nobody has ever been in a position to tell you it isn't."

"That's the whole reason to go, Doctor. Somebody has to be the first person in a position to say either."

She had said almost exactly that sentence to Kilbride, two years and one much smaller commitment ago. Hearing it now, aimed back at her, from someone about to travel considerably further than anyone she'd said it to before, told Pitch something about her own model she had not fully reckoned with until this exact moment: it had been correct enough, once, to become a kind of faith. She had not built it to be believed in. She had built it to be checked.

She did not go to the docking ring this time either. She told herself the reasons were the same as two years ago. They were not quite the same, and she noticed that they weren't, and she stayed at her desk anyway, and began drafting the report she hoped she would never have cause to file.