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"In science fiction one can say a great many things that are unpalatable, because it's expressed as science fiction you can slip it past their defenses."
- Frederik Pohl

Gravity Port  
  Used for refueling.  

In space, a gravity port opened on a vortex of force which could suck dry in an instant any receptacle pressed lightly against it.
From Shadow Over Venus, by Frank Belknap Long, Jr..
Published by Startling Stories in 1946
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