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interval.”
    “It’s close …”
    “Not that close,” she said. “I got the plates from a few weeks ago. Rick, I had to trace back damn near night by night, it’s moving so fast! It’s in a hyperbolic orbit.”
    “Come on, it can’t be!”
    “It is,” Dr. Mouton said.
    “Excuse me,” Jeanette said. They both turned to look at her. They’d obviously forgotten she was there. “What’s a hyperbolic orbit?”
    “Fast,” Owen said. “Moving too fast for the sun’s gravity. Objects in a hyperbolic orbit can escape from the solar system altogether.”
    She frowned. “How could something be moving that fast?”
    “Big planets can make it happen.” Richard said. “Disturb something’s orbit …”
    “It’s under power,” Mary Alice Mouton said.
    “Aw, come on!”
    “I know it’s silly, but it’s the only explanation I can think of. Rick, I’ve followed that thing backward for weeks, and it has decelerated most of the way.”
    “But …”
    “Jupiter can’t do that. Nothing can.”
    “No, of course it — Mary Alice?”
    “The computer plot fits perfectly if you assume it’s a powered spacecraft.” Dr. Mouton’s voice had taken on a flat, dry note. “And nothing else does.”
    An hour later. Two more astronomers had come in, looked at the plates, and left shaking their heads. One had insisted that whatever else they found, the early plates were genuine; he’d taken them himself. The other hadn’t even admitted seeing anything.
    Owen used the telephone to call Arizona . “Laura? Rick Owen. We’ve got something funny here. Did any of your people happen to get pictures looking south of Leo the past few weeks?” He read off a string of coordinates and waited for a few moments.
    “Good! Looked at them? Could you please go look? Yes, now. I know it’s not convenient, but believe me, it’s important.”
    “You don’t really believe that’s a powered ship, do you?” Jeanette asked.
    Mary Alice looked at her with haunted eyes. “I’ve tried everything else, and nothing fits the data. And yes, I remember the pulsars!” which meant nothing to Jeanette.
    They drank coffee while Owen talketh. Finally he put down the phone. He looked flightened. “Kin Peak has seen it,” he announced. “Chap named Tom Duff, a computer type, spotted it. They didn’t believe it. It’s just where we saw it. Mary Alice, you may have a problem about credit for discovery.”
    “Bother the credit, what is it?” Dr. Mouton demanded. “Rick, it’s big, and it’s under power, and it’s coming here.”
    In California it would be three in the morning. Linda heard the phone ring three times, then the sleepy voice. “Yes?”
    “Linda, this is Jenny.”
    “Jenny? But — well, hello, is something wrong?”
    “Kind of, Sis. I need to talk to your husband. Fast.”
    “What?” There was a pause. “All right.”
    “And get him some coffee,” Jenney said. “He’s going to need it.”
    Presently she heard the newly awakened voice of Major General Edmund Gillespie. “Jenny? What’s wrong?”
    “General, I have something strange to report …”
    “General. Are you being official?”
    “Well … formal. Yes, sir. I’ve already called my colonel, and he agreed that it would be a good idea to call you.”
    “Just a second, Jenny. Linda, where’s that coffee? Ah. Thanks. Okay, shoot.”
    “Yes, sir.” As she spoke, she tried to imagine the scene. General Gillespie sitting on the edge of the bed, growing more and more awake. His hair probably looks like his head is exploding. Linda pacing back and forth wondering what in the world is going on. Maybe Joel had been awakened. Well, there wasn’t any help for that. A lot of people were going to be losing sleep.
    “Jenny, are you seriously suggesting that this is … an alien ship? Men from Mars and all that?”
    “Sir, we both know there can’t be any men from Mars. Or anywhere else in the solar system. But this is a large object, it’s moving faster