Starplex

Since second-generation stars coalesced from such clouds, a full percent or a bit more of a second-gen's mass comes from metals — 'metals' in this context meaning elements heavier than helium.

Third-generation stars are even more recent; the suns of all the Commonwealth homeworlds are third-gens, as are all stars being born today, although, of course, some first-gens and a lot of second-gens are still around, too. Third-gens consist of about two percent metals." Jag paused for a moment, and looked from face to face in the room.

"Well," he said, "that star" — he gestured with one of his medial arms at the green orb in the holo sphere "has about eight percent of its mass as metals, four times as much as even a typical third-gen. The thing has enough iron in it that you could actually mine it."

"What about the green color?" asked Keith.

"It's not really green, of course, any more than a so-called red star is actually red. Almost all stars are white, with just a hint of color."

He gestured with his medial limbs at the starfield around them.

"PHANTOM routinely colorizes the stars in our holo bubble, assigning them colors based on their Hertzsprung-Russell categories. The star out there just has a greenish tinge. The absorption-line blanketing due to its metal content is stronger than the backwarming, and that weakens the star's output in the blue and ultraviolet. The result is more of the star's light coming out in the green region of the spectrum." His fur danced. "I would have said a star with so much metal content would be impossible in our universe at its present age if I hadn't seen one with my own four eyes. It must have formed under very peculiar local conditions, and—"

"Forgive the interruption, good Jag," said Rhombus, "but I'm detecting a tachyon pulse."

Keith swiveled in his chair, facing the shortcut.

"Gods," said Jag, rising to his feet. "Most stars are part of multiple star systems—"

"We can't take another close passage," said Lianne.

"We'll—"

But the shortcut had already stopped expanding. A small object had popped through. The gateway had grown to only seventy centimeters in diameter before collapsing down to an invisible point.

"It's a watson," announced Rhombus. An automated communications buoy.

"Its transponder says it's from Grand Central Station."

"Trigger playback," Keith said.

"The message is in Russian," said Rhombus.

"PHANTOM, translate."

The central computer's voice filled the room. "Valentina Ilianov, Provost, New Beijing Colony, to Keith Lansing, commander, Starplex. An M-class red-dwarf star has erupted from the Tau Ceil shortcut.

Fortunately, it emerged heading away from Tau Ceil, rather than toward it. So far, no real damage has been done, although we had trouble piloting this watson past the star and into the portal. This is our third attempt to reach you. We did manage to contact the astrophysics center on Rehbollo for advice, and they had the incredible news that a star has popped out of the shortcut near them as well — a blue B-class star, in their case. I am now contacting all other active shortcuts to find out just how widespread this phenomenon is. End of message."

Keith looked around the bridge, bathed in green starlight.

"Christ Jesus," he said.

Chapter IX

"I say we're under attack," announced Thoraid Magnor, getting up from the helm position, and walking over to the seating gallery to sit a few chairs to the right of Jag. "We've apparently been lucky so far, but dropping a star into a system could destroy all life there."

Jag moved his lower two arms in a Waldahud gesture of negation. "Most shortcuts are in interstellar space," he said. "Even the one you call "the Tau Ceti shortcut' is still thirty-seven billion kilometers from that star, more than six times as far as Pluto is from Sol. I would say that in fifteen out of sixteen cases, the arrival of additional stars would have minor effects on the closest systems, and, since inhabited worlds are few and far between, the chances of actually doing short-term damage to a planet with life on it are quite small."

"But could these stars be, well, bombs?" asked Lianne. "You said that the green star is very unusual. Could it be about to explode?"

"My studies of it have only begun," said Jag, "but ! would say that our new arrival has at least a two billion years of life left. And singleton M-class dwarfs, like the one that popped out near Tan Ceti, don't go nova."

"Still," said Rissa, "couldn't they disturb the Oort clouds of star systems they pass close to, sending showers of comets in toward the inner planets? I remember an old theory that a brown dwarf dubbed — Nemesis, I think it was — might have passed close to Sol, causing an onslaught of comets at the end of the Cretaceous."