Perhaps now that they had plenty of room again, peace .would once more reign aboard Starplex.

While at the Rehbollo shipyards, five new researchers were brought aboard — one Ib and two Waldahud dark-matter specialists, and a dolphin and a human who were experts in stellar evolution. All of them had dropped everything at receipt of Starplex's reports, and immediately headed through the shortcut network to rendezvous with the ship at Flatland.

As she had promised, Lianne finished the refit in less than eighteen hours. Thor piloted the ship back through the shortcut, and they teemerged in the vicinity of the dark-matter field and the enigmatic green star.

Starplex's designers had planned to put the director's office adjacent to the bridge, but Keith had insisted that be changed. The director, he felt, should be seen all over his ship, not just in one isolated area.

He had ended up with a large square room, almost four meters on a side, located on deck fourteen, halfway along one of the triangular faces of habitat module two. Through the window that covered one wall, he could see module three, perpendicular to the one he was in, as well as a ninety-degree slice of the copper-colored circular roof of Starplex's central disk sixteen floors below. That particular part of the roof was marked with Starplex's name in wedge-shaped Waldahudar lettering.

Keith sat behind a long rectangular desk, made of real mahogany. On it were framed holos of his wife Rissa, looking exotic in an old-fashioned Spanish dancing dress, and their son Saul, wearing a Harvard sweatshirt and sporting that strange goatee that was the current fashion among young men. Next to the holos was a 1/600 scale model of Starplex. Behind his desk was a credenza with globes of Earth, Rehbollo, and Flatland on it, as well as a traditional go board with playing pieces of polished white shell and slate.

Above the credenza was a framed print of an Emily Cart painting, depicting a Haida totem pole in a forest on one of the Queen Charlotte Islands. Flanking the credenza on either side were large potted plants.

A long couch, three polychairs, and a coffee table were also in the room.

Keith had his shoes off, and had swung his feet up on his desk. He never emulated Thor while on the bridge, but when alone he often adopted this posture. He was leaning back in his black chair, reading a report on the signals Hek had been detecting, when the door buzzer sounded.

"Jag Kandaro em-Pelsh is here," announced PHANTOM.

Keith sighed, sat up straight, and made a let-him-in motion with his hand. The door slid aside, and Jag walked in. After a moment, the Waldahud's nostrils started flaring, and Keith thought perhaps Jag could smell his feet. "What can I do for you, Jag?" The Waldahud touched the back of one of the polychairs, which configured itself to accommodate his frame. He sat down and began to bark. The translated voice said, "Few of your Earth literary characters appeal to me, but one who does is Sherlock Holmes."

Keith lifted an eyebrow. Rude, arrogant — yes, he could see why Jag might like the guy.

"In particular," continued Jag, "I like his ability to encapsulate mental processes into maxims. One of my favorite sayings of his is, "The truth is the residue, lacking in likelihood though it may be, that is left behind when those things that cannot be are omitted from consideration.""

That, at least, brought a smile to Keith's face. What Connan Doyle had actually written was, "Eliminate the impossible, and whatever remains, however improbable, must be the truth," but considering that the words had been translated into Waldahudar then back into English, Jag's version wasn't half-bad.

"Yes?" said Keith.

"Well, my original analysis, that the fourth-generation star that appeared here was a one-of-a-kind anomaly, must now be amended, since we've seen a second such star at Rehbollo 376A. By applying Holmes's dictum, I believe I now know where these two green stars, and presumably the other rogue stars as well, have come .from." Jag fell silent, waiting for Keith to prod him further.

"And that is?" Keith said, irritated.

"The future."

Keith laughed — but then, he had a barking laugh; perhaps it didn't sound derisive to Waldahud ears. "The future?"

"It is the best explanation. Green stars could not have evolved in a universe that is as young as ours is. A single such star could have been a freak, but multiple ones 'are highly unlikely."

Keith shook his head. "But perhaps they come from — I don't know — some unusual region of space. Maybe they had been companions of a black hole, and the gravitational stresses had caused fusion reactions to proceed more quickly."

"I thought of such things," said Jag. "That is, I thought of probable alternative scenarios, of which that is not one. But none of them fits the facts. I have now done radiometric dating, based on isotope proportionalities, of the material Longbottle and I scooped from the atmosphere of the green star near us. The heavy-metal atoms in that star are twenty-two billion years old. The star itself is not that old, of course, but many of the atoms it is composed of are."

"I thought all matter was the same age," said Keith.

Jag lifted his lower shoulders. "It's true that, excepting the small amount of matter constantly being created out of energy, and excepting that in certain reactions neutrons can essentially turn into. proton-electron pairs, and vice versa, all fundamental particles in the universe were created shortly after the big bang. But the atoms made up of those particles can be formed or destroyed at any time, through fission or fusion."

"Right," said Keith, embarrassed. "Sorry. So you're saying the heavy-metal atoms in the star formed longer ago than the universe is old."

"That's correct. And the only way that could happen is if the star came to us from the future."

"But — but you said the green stars are billions of years older than any current star could be. You're trying to tell me that these stars have traveled back in time billions of years?

That seems incredible."

Jag preceded his barking reply with a snort. "The intellectual leap should be in the acceptance of time travel, not the length of time an object is cast back. If time travel can exist at all, then the distance traveled back surely is only a function of appropriate technology and sufficient energy. I submit that any race that has the power to move stars around has both in abundance."

"But I thought time travel was impossible."

Jag lifted all four shoulders. "Until the shortcuts were discovered, instantaneous transportation was impossible.

Until the hyperdrive was discovered, faster-than-light travel was impossible. I cannot begin to suggest how time travel might be made to happen, but apparently it is happening."

"There are no other explanations?" asked Keith.

"Well, as I said, I have considered other possibilities — such as that the shortcuts are now acting as gateways to parallel universes, and that the green stars come from there rather than from our future. But except for their age, they are what one would expect of matter formed in this specific universe, from our specific big bang, under the very specific physical laws that operate here."

"Very well," said Keith, holding up a hand. "But why send stars from the future back to the past?"

"That," said Jag, "is the first good question you have asked."

Keith spoke through clenched teeth. "And the answer is?"

Jag lifted all four shoulders again. "I have no idea."

As he moved down the dim, cold corridor, Keith accepted that each of the races aboard Starplex managed to piss the others off in different ways.

One of the things humans did that he knew bugged the hell out of everyone else was spending endless time trying to come up with cute words made from the initial letters of phrases. All the races called such things "acronyms" now, since only the Terran languages had a word for them. Early on in planning Starplex, some human came up with the term CAGE for "Common Access General Environment," referring to the shipboard conditions in those areas that had to be shared by all four races.