Jack Williamson

A terrestrial astronomer may reckon that the outburst on Nova Persei occurred a century before the great fire of London, but an astronomer on the Nova may reckon with equal accuracy that the great fire occurred a century before the outburst on the Nova.

“That is a space-port where the ships come in from the stars,” the girl said. (Of course, all conversations recorded in Smith’s notes have been translated into our English—if they were not, no one would be able to read them.)

“Ships from the stars!” Dick ejaculated.

Time was a fourth dimension, he had said. An extension as real as the three of what we call space, and not completely distinguishable from them. A direction in which motion would carry one into the past, or into the future.

I must have a subject. And there is a certain—risk. Not great, now, I’m sure. My apparatus is improved. But, in my first trial, my subject was—injured. I’ve been wondering, Mr. Webb, if you—

He looked at the fantastic, beauteous sleeper, and his haggard face was terrible again with longing and despair and dread.

But Max Planck with the quantum theory, de Broglie and Schroedinger with the wave mechanics, Heisenberg with matrix mechanics, enormously complicated the structure of the universe—and with it the problem of Time.

With the substitution of waves of probability for concrete particles, the world lines of objects are no longer the fixed and simple paths they once were. Geodesics have an infinite proliferation of possible branches, at the whim of sub-atomic indeterminism.

Still, of course, in large masses the statistical results of the new physics are not much different from those given by the classical laws. But there is a fundamental difference. The apparent reality of the universe is the same—but it rests upon a quicksand of possible change.

The tracer fields are following all the world lines that intersected at the battle, back across the months and years. The analyzers will isolate the smallest—hence most easily altered—essential factor.

With the new tri-polar units I can deflect the projection field back through time. That’s where I’m going to attack Levin—in his vulnerable past.