"Elroy . . ."

Gorey took them in. As they closed, a port began to open in the middle of the smaller rainbow target, and a massive shelf pushed out.

"One damn fine mousetrap," Clover laughed.

"Not helping, John," Barnes snapped.

Sandy glanced at Fiorella, who was smiling into the mini-Red she'd stuck to the rail of the bus, talking a kilometer a minute.

Barnes: "That shelf could take the bus. Do we land it? Or do we leave the bus hanging? If we land it, it'll rotate out of sight."

There was a long silence, then Fang-Castro said, "We now agree here that you should land the bus. Then, if you're asked to leave, or pushed out, you'll have something to leave with-you won't be hanging on the wrong side of the primary without a ride."

Barnes: "Take it in, Elroy."

The bus landed on the primary without incident and extruded the Post-its to hold it to the surface. As soon as the bus was secure, the crew began unplugging from the bus and to go on full internal suit support.

Barnes worked through the agreed-upon procedure: "Everyone stay together. Check your tethers. I don't want anyone flying free. Nobody touch anything without my approval. Nobody armed except Emwiller, and make sure your weapon is safed, Sally. No other external equipment except for Sandy's camera gear. Ready?"

They were ready.

"Then let's go."

- They floated just above the regolith of the primary. As soon as they moved away from the bus, maneuvering with their suit thrusters, a line of glowing dots appeared on the regolith leading toward the rainbow target. The dots flowed toward the open port.

"Interesting," said Hannegan, the physicist. "The surface doesn't change, it's like the light is moving through it. I'm guessing some kind of cellular automata or nanobots, they're what's making the lights. Nice. The ultimate programmable signage. You getting this, Sandy?"

"I am now." Sandy was pointing his camera at the surface, cranked up to maximum magnification. In his viewfinder, he could see the surface was packed with speckles that brightened and darkened in a coordinated way. They reminded him of the chromatophores he'd seen on the skins of squids and octopi.

The crew floated through the open port into a white, cube-shaped chamber, large enough for a small orchestra. The door that was open to space was behind them, but there was a closed door in front of them. A green pad the size of a dinner plate was next to the closed door.

Barnes looked at Clover. "What do you think?"

"What does green mean, on traffic signals almost everywhere on Earth?"

Barnes shrugged, reached forward, and punched the button.

The door behind them closed and a light winked on Sandy's camera: "George, I just lost the link back to the Nixon."

Barnes tried calling the Nixon. There was no response. "The interior must be EM-blocked. Why am I not surprised? Okay, people, we are really on our own now. You follow my orders. You do what I tell you, when I tell you to do it. You do not take the initiative, not if you ever want to come back here again. We take everything slowly."

Gas began venting into the chamber. When it hit one atmosphere, according to their suit gauges, the inner door opened. They moved forward, and somebody muttered, "Standard air lock . . ."

When they'd all entered the second chamber, the door behind them closed. The room was larger than the first, but not much, possibly ten meters long and eight wide, also a featureless white with diffuse lighting. The only item in the room was a stand-alone console toward the back of the room. A meter and a half high, it would've been impossible to miss even if the room had been as cluttered as a secondhand junk store: it glowed with flickering bands of rainbow colors and looked disturbingly similar to an antique jukebox.

Words appeared in the air above the console that read: "You can remove your helmets. The air is sterile and breathable to Earth standards and is maintained at 21 degrees Celsius." In a few seconds, the words changed to Chinese ideograms, followed by Arabic and Russian, then a half-dozen other languages, before it cycled back to English. Barnes looked over at Emwiller and said, "Sal, I'm cracking my helmet. If I collapse, get everyone out of here, pronto. Shoot out the air lock if you have to."

"Wait, wait, wait . . ." said Stuyvesant. "What if there are biologics in here?"

"That'd be another unnecessary mousetrap," Clover said.

"They could be unintentional-"

"We haven't seen anything unintentional so far. . . . I believe the air will be safe."

"I'm going to unseal," Barnes said. "Sally, stand by."

They all watched as he unclipped the faceplate on his helmet and took a deep breath. And held it. And let it out and took another. He took a few more breaths and licked his lips, tasting the air, and finally nodded. He pushed the faceplate closed again, resealed it, and said, "The air seems to be okay, but I want everybody to stay sealed. When we get back, I'll go into isolation to check for biologics. Let's go to Post-its."

They all reached down and threw switches on the legs of their EVA suits. When upward pressure was placed on a boot, a pressure switch would cut the electrical charge and the boot would peel away from the floor with about the same resistance as Earth gravity.

As they all stuck to the floor, or deck, or whatever it was, new words appeared over the polychrome console. "Please say something to me."

"Speakers and mikes, now," Barnes said, and they all went to external speakers and microphones.

The phrase repeated in the same other dozen languages they'd seen in the first message.

Barnes said, "Hello. We're from Earth. Uh, the third planet in this system."

Colors shifted across the sides of the alien console making it look even more like a jukebox, and then it spoke: "American English. I can speak in American English. Now, what questions do you have?"

Barnes asked, "Who are you?"

The jukebox said, "I am not a 'who' but a 'what.' I am a low-grade artificial intelligence tasked with answering questions. I am programmed to understand thirteen human languages, five of them based on the probability of being the first-contact languages. In order, the probability for first contact was American English, Chinese, Russian, Arabic, and Portuguese. I am not a fully intelligent AI. I chain rhetorical logic via a statistical grammar. Though it may sound as though I'm being conversational, in fact I am always responding directly or indirectly to questions. My data storage has the answers to 71,236,340 explicit or implicit questions. I can synthesize new answers from those I am preprogrammed with, but at times you will ask questions for which I have no answer, to which I will reply, 'I don't know.'"

Barnes asked, "Can we set up camera equipment to record this conversation?"

"Yes. I will wait."

Barnes nodded at Sandy, who'd had the mini-Red under his arm, recording first contact as clandestinely as he could. Now he broke three more cameras out of his carrying case and began setting them up in the bare room.

Clover asked the jukebox, "Are there any other species here now?"

The AI said, "No, you are the only species here at this time."

Clover: "When are you expecting others to arrive?"

"I don't know. That is not an omission from my database. There is no predefined schedule for arrival. Previous intervals between arrivals have ranged from two years to three hundred and ninety-six years."

"Who made you?"

"I don't know."

"Where are your makers?"

"I don't know."

"Why don't you know?"

"When they left, they didn't tell me who they were or where they were going."

"When did they leave?"

"One thousand seven hundred and fifty-three Earth years ago."

Hannegan: "How old is this facility? The aliens . . . uh, the beings who recently left, they weren't your makers?"

"This depot is 21,682 Earth years old, and I don't know if the species that recently departed were my makers, because I don't know who my makers were."

Stuyvesant: "Can you tell us what the other species look like?"

"No. There may be some visual recording facilities on this depot, but I do not have access to them."

Stuyvesant: "Do you provide this service to species other than humans? Do you speak languages not derived from Earth?"

"Yes."

Barnes: "How can you run this depot with so little critical information?"

"I do not run this depot. It is separately automated. I am here to answer questions."

Hannegan muttered, "Not very helpfully, so far."

Clover wagged a finger at him: "Are you programmed to deny us information about your technology?"

"No. Ninety percent of my information is about technology. I contain complete descriptions, operation details, status reports, maintenance records, documentation, and instructional and design manuals for this station, and for its satellites."

Barnes: "Tell us all about the depot."

"That would not be a good idea."

"Why?"

"I would not know what you would want to know. I would start with the first facts in my memory and proceed through the databases in an orderly manner. Done orally, it would take seventeen Earth years. Do you have sufficient time?"

Clover: "Don't you have more efficient ways to transmit information than talking?"

"Of course, but I do not know which ones of them, if any, are usable by you. Technology changes very rapidly. In comparison, language changes extremely slowly. I doubt you are equipped with I/O protocols from even a century ago. But English, as spoken several centuries ago, would still be comprehensible to you today. If you have communications specialists I can talk to, we can probably find a mutually agreeable protocol."

Clover: "And you are willing to transfer that data to us?"

"Yes."

Barnes held up a hand to slow him down, then looked at the jukebox: "You say you can't tell us about your makers or other species. Is that because you are prohibited from sharing that information, or because it's not in your databases?"

"Your question is not entirely correct. I do have some limited information about my makers and other species, but you have not asked the correct questions to elicit that response. As to your other point, I am not prohibited from answering any questions for which I have information. Everything I know or can synthesize is accessible to anyone who asks me questions."

Clover jumped in: "What would be the correct questions that would elicit your programmed response about your makers and the other species?"

"The correct questions would be: First: 'Are your makers afraid of us?' The correct answer would be, 'Not at this time.' Second: 'Should we be afraid of them?' The correct answer would be, 'Not at this time.' Third: 'Should we consider them hostile to our species?' The correct answer would be, 'No.'"

Emwiller looked at Barnes: "Sir, should we be trusting these answers?"

Barnes shrugged: "I don't know."

Clover asked the jukebox, "Is there some way we can determine if you're telling the truth or not?"

"Not that I am aware of, but I have not been programmed to lie. I am not an advanced AI. I cannot construct elaborate fabrications. If I were to mix false information with the true, it is likely the questioner would eventually find a discrepancy or contradiction in my answers. Lying would also interfere with my function, which is to provide instructional information on how to best make use of this depot and to ensure that visitors do not harm the depot or themselves unintentionally."

Clover turned to Barnes: "What we have here is the 'all Cretans are liars' problem. Its responses make sense, but this could be a very elaborate fabrication. I'd say that either this machine is pretty much as it seems, or it's much more sophisticated than we can imagine, a very high-level AI, well beyond our systems, masquerading as a low one. I think we have to assume the former until proven otherwise, because there's not much we can do if it isn't true."

Hannegan said, "But if it feeds us incorrect information on physics, we'll find that out pretty quickly. I personally don't care if it's lying about what the various species are like, if it could deliver, say, a thirtieth-century Physics Handbook."

Stuyvesant: "That's a little parochial, Bob."

Hannegan: "Yeah, well, what if he could deliver a thirtieth-century Biochemistry Handbook?"

"That would be helpful," Stuyvesant admitted.

Barnes said, "Our jukebox raised another concern. New question: Why do we have to worry about harming ourselves or the depot?"

The jukebox said, "This depot has technologies and artifacts from many different species. No visitor could be familiar with them all. Some of these devices are dangerous if misused, the same way a milling laser is dangerous if misused."

Clover nodded: strange technology, strange tools.

The jukebox: "Also, there are containment modules that should not be accessed without proper instruction, as they currently hold a total of eight hundred and forty-nine tonnes of antimatter."

"Holy shit," Hannegan said. "Uh, where did all this antimatter come from?"

"It's manufactured here."

Before anyone could say anything, Barnes barked, "All right, everybody, speakers off, intersuit comm channel 7, full encryption, wait for my lead."

When everybody had gone to encryption, he said, "This is exactly why our mission was top priority for the U.S. We need to secure this, or make sure that nobody else gets their hands on it. That is a buttload lot of antimatter. Bob, thoughts?"

The physicist had been looking off in a distracted way and tapping the fingers of one hand together. "Yeah, I'm doing a little mental arithmetic here. If the Wurlitzer is telling the truth, that's on the order of a teratonne explosive equivalent. Call it a million of those H-bombs the superpowers used to stockpile. Which immediately has me wondering, first, where is it? And second, how are they making it? Related to that, where are they getting the power to make it?"

Barnes said, "Numbers one and two are what most concern me. Plus, there's a number four: Will the answer-bot tell us how to make it?"

"Let's go back to the jukebox." They turned back to the answer-bot. "Excuse us, we need to discuss the information you imparted."

"My programming informs me that is very common with first arrivals and I am not programmed to take offense in any way. Do you have any other questions at this time?"

Hannegan cleared his throat: "Uh, you said this depot stored over eight hundred tonnes of antimatter. Where? And how?"

The jukebox said, "The constellation of small moonlets you see associated with this depot are the containment modules for the antimatter. The material is in the form of iron-58, which is electromagnetically isolated from the walls of the modules."

Hannegan raised his eyebrows: "Anti-iron? We can barely manage anti-helium. How do you make this and where do you get the power? For us, manufacturing that quantity of antimatter would require roughly a year's worth of solar output."