Stephen’s rich inventor uncle sends him on a trip to the moon in an antigravity capsule without realizing that a side-effect also sends the capsule back to when the moon was young, green, and populated by the evil Eternal Ones and the last of the Mothers.
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.

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  1. “The Moon Era” by Jack Williamson, in Wonder Stories, February 1932.
  2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Jack Williamson