that can impose such a systematic, exactly timed compressive pulse on a whole star?"
"You mean, what physical process can produce that effect?"
"I wish I meant that, but I don't." Wilmer seemed upset, and to Celine that was a bad sign. Wilmer never became uncomfortable when physics was the subject. "We've racked our brains, Star and me, trying to come up with a natural explanation for what happened. And we can't. The timing sequence of the impulses needed to make Alpha C go pop is so peculiar and improbable, I don't see how it could possibly arise naturally. Something or somebody produced that sequence by design. Something made that star system go supernova."
While Celine stared in disbelief, Astarte said, "Tell her the rest. About the gamma pulse and the particle storm."
"Oh, yes." Wilmer rubbed the bald patch on the top of his head—already red and inflamed from his previous attentions. "It turns out that the right sequence of impulsive compressions needed to provide a supernova is not radially symmetrical. Certain modes of oscillation must be excited, and that in turn gives preferred directions of emission for gamma rays and for the charged particle beam. Everyone always assumed that the fact that the gamma-ray beam was aimed to hit Earth, twenty-seven years ago, was a piece of pure bad luck."
"Wasn't it?" Celine was wondering if she could ever explain to anyone else what Wilmer and Astarte had been saying. Not one of her colleagues had any previous experience with Wilmer, or understood his brilliance and intellectual honesty.
"It wasn't bad luck," Wilmer said, and Astarte nodded firmly.
"Calculations show that it can't be an accident," she added. "Yer see, the Sun moves at thirty-two kilometers a second relative ter Alpha Centauri. Ter have a narrow gamma-ray beam intersect the position of Sol, twenty-seven years ago, and then ter have the main front of the particle storm hit Sol again, in its new position tens of billions of kilometers away—that's off the scale on the probability charts.
"Something made Alpha Centauri go supernova. And that same something arranged for the gamma pulse and the particle storm ter run right smack bang into our solar system."
7
From the private diary of Oliver Guest.
A Proustian obsession with one's own past is, to my mind, an indicator of mental illness.
And yet, sometimes, it is necessary.
Seth Parsigian had departed at midday telling me that he was going to "check out ideas" that might solve the problem of my inability to face a trip to Sky City. He did not tell me what those ideas were. I did not ask. Nor did he mention an intention to return. I knew the man. He would be back.
Meanwhile, there were the records. Parsigian left with me a mountain of data and conjectures relating to the twelve murders, together with the less-than-helpful advice "See what you can sift out of it, Doc."
Sifting, however, was not what I had in mind when I sat down, early the same afternoon, to begin my review of the material that he had left with me. What I sought was that intangible sense of contact, the ineffable touch of another's mind.
Murders, particularly murders of compulsion, represent consequence rather than cause. They occur as the result of some particular motivation. In my own case, it was-and is-a desire to match mental to physical perfection. What, then, motivated the murderer of teenage girls in Sky City? What had been in his mind before he killed?
I examined once more the known facts of the murders, and found thin gruel. I had the dates, the circumstances and places of death, the physical descriptions, and the names: Myra Skelton, Tanya Bishop, Doris Wu, Cissy Muller, April Jarrow, Brenda Cleve, Lucille DeNorville, Denise Braidley, Julia Vansittart, Elke Edson, Georgina Yang, and Kate Ulrey. What did they have in common?
They were young, they were female, and they were dead.
More informative, perhaps: What did they not have in common? They were of widely variable wealth and
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