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"I kind of take it for granted that our great-grandchildren will regard us as a sort of precursor species. That they won't think of us as human and if we could see them, we probably wouldn't think of them as human either."
- William Gibson

Wango Wave  
  Energy surge that accompanies the entrance into, and exit from, overdrive outside of normal space.  

One way to look for an interstellar civilization (in this story) is to look for "wango waves" - energy surges that mark entrance to and exit from overdrive.

After leaving the Kennessee it would drive away at thirty-five gravities acceleration for fifteen minutes and then go into overdrive - when it would cease to exist as far as normal space was concerned. Its disappearance would be marked by the emission of a monstrous surge of energy - a "wango wave" - which could be detected at hundreds of millions of miles. Near home base it would come out of overdrive with the emission of another, similar wave.
From Propagandist, by Murray Leinster.
Published by Astounding Science-Fiction in 1947
Additional resources -

Yet another of the endless variations on the technology and phenomena of hyperspace.

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Additional resources:
  More Ideas and Technology from Propagandist
  More Ideas and Technology by Murray Leinster
  Tech news articles related to Propagandist
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