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"A science fiction story is a story built around human beings, with a human problem and a human solution, which would not have happened at all without its scientific content."
- Theodore Sturgeon

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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