That meant it did not, could not, belong to the solar system.

There was no question that vast numbers of comets drifted through the interstellar void, unattached to any sun. The latest estimates Feinberg had seen placed the number of unattached comets in the neighborhood of the solar system and out to, say, the half-dozen or so nearest stars, somewhere in the range of a trillion. He did not personally subscribe to that view. It was true that comets were periodically ejected from the solar system by the Sun, and sometimes even by Jupiter. He could not see that the process happened sufficiently often to support the more wild-eyed theorists. But who really knew?

In any case, this appeared to be a true interstellar. If both sightings were the same object, it had to be.

No interstellar comet had ever been recorded. If he was right, Wesley Feinberg was going to take his place with Shapley, Herschel, Eddington, and Galileo.

Assuming the two bodies were the same, he now tried to calculate a trajectory. At the kind of velocity he'd expected, around forty kilometers per second, the comet would curve around the Sun and go back out. But at four hundred kilometers per second, it was going to keep coming.

With any kind of luck, they might get an extraordinary show.

He went out and delivered a cheerful good morning to the security guard, who seemed to be the only other person in the observatory. "I thought about waking you, sir," the guard said. "You didn't look comfortable on that couch. But I thought it best not to disturb you."

Feinberg gave the man his most amiable smile. "Exactly right, sir," he said. "Exactly right." He turned on the coffee machine in the meeting room adjoining Hoxon's office. He was hesitant to move precipitately, but it was only a matter of time before someone else drew the same conclusions he had. If that happened, he'd have to share credit. So he went back to his computer and forwarded his data to the Astronomical Union's Central Bureau in Cambridge, where they would be logged and redistributed.

Please, God, let it be true.

NEWSNET. 12:30 P.M. UPDATE.

(Click for detail.)

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ST. LOUIS WOMAN DISCOVERS COMET DURING ECLIPSE

Sun's Glare Had Hidden Celestial Visitor Moonbase, on tour. 4:30 P.M.

Isabel Heyman, who usually worked with the special response detail at the White House, had politicked to get the Moonbase assignment. That she'd succeeded was less attributable to her influence than to the fact that the agents usually assigned to the vice president had been working long hours as he plunged into the crucial early primaries. Unlike Isabel, they did not perceive a flight to Luna, with a reduced force that guaranteed round-the-clock hours, as a benefit.

So now Isabel toured the Greenhouse, keeping station on Teddy's left, surveying faces for any telltale suggestion of ill intent, looking for tics or compressed lips, for eyes perhaps a little too narrowly focused, for any sudden movement, for a hand slipped inside a garment.

It was hard, wandering among Moonbase's wonders, to keep her mind on her job. But her training took over, and it was enough just to know where she was.

She would come back, she decided. On her own.

CHAPTER THREE

FORECASTS

Wednesday, April 10

1.

Arecibo, Puerto Rico. 8:03 A.M. Atlantic Time (7:03 A.M. EDT).

The radar returns had been coming in for several hours. Tomiko was a monster, 180 kilometers in diameter. But the incredible revelation was its velocity: It was moving at 480 kilometers per second! Yesterday Foster Cardwell would have bet the mortgage that order of velocity wasn't possible.

Cardwell was director of operations at Arecibo. He stood over the display, rubbing the back of his neck. He was wearing a bright yellow shirt stenciled with palm trees and dolphins. "Run it again," he said.

Penny McGruder nodded and keyed in the command. "It's not going to look any different."

A cursor moved unerringly toward a rendezvous with the Earth-Moon system. The comet was passing the Sun now. It would cross the orbit of Mercury later today, and that of Venus early Friday. It would close to within 384,000 kilometers of Earth. Where it would strike the Moon!

"Are we sure?"

They checked everything again.

Saturday night. At ten thirty-five EDT.

"Cardy," she said, "this comet doesn't obey the rules."

He nodded and shrugged.

She highlighted the velocity: 480. What would it do to the Moon?

"It'll be a hell of a show," he said.

• • • Beaver Meadow Observatory. 7:33 A.M. EDT.

Feinberg was ecstatic. Messages of congratulation had already begun pouring in. Tomiko was indeed an interstellar. But even given that, its velocity was difficult to account for. They would have to rethink some of their assumptions.

A variety of emotions washed through him when he saw it would impact on the Moon. There would be a magnificent display, and they'd have an unparalleled opportunity to observe their extrasolar visitor. Why, then, did he feel a sense almost of despair?

He'd have given much to see a mission to the comet. Who knew what they might have learned, given an opportunity to do an inspection. Perhaps they would even have uncovered the secret behind its velocity.

He'd given much thought to the matter. The object was billions of years old. Had to be. It had experienced a series of encounters, each accelerating it until it reached its present rate. It seemed a farfetched explanation. Yet, what other possibility was there?

Hoxon dithered about, worrying that Feinberg's health would suffer if he didn't "get out and get some fresh air."


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