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"The point sticks in your head: physics rules. Virtue does not triumph unless the physics allows it."
- Larry Niven

Gravity Planer  
  Device that creates a gravity field.  

"...That's one of the most primitive spacecraft I've ever seen." He moved his claw about on the screen, pointing as he talked.

"The outer shell is an iron alloy. The rotating ring is a method of imitating gravity by using centripetal force. So they don't have the gravity planer. In fact they're probably using a reaction drive."

The Captain's catlike earls went up. "But we're lightyears from the nearest star!"

"They must have a better reaction drive than we ever developed. We had the gravity planer before we needed one that good."

From The Warriors, by Larry Niven.
Published by Worlds of If in 1966
Additional resources -

Read this excerpt from Brigands of the Moon (1930), by Ray Cummings, describing artificial gravity.

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