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"By the time I can take people out to where Hubble is looking, they won't be human anymore, by a long way."
- Larry Niven

Zero-Gravity  
  A state in which gravity is effectively absent or cancelled out.  

Starting at the zero-gravity of earth's core, accumulative acceleration is easily built up in a four-thousand-mile tube.
From If Science Reached the Earth's Core, by John R. Binder.
Published by Thrilling Wonder Stories in 1938
Additional resources -

This term appeared first in this work, which is an essay rather than a story.

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Additional resources:
  More Ideas and Technology from If Science Reached the Earth's Core
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