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"Another reason why privacy could be just a passing fad, terrorism is going to get too good. [1997]"
- Larry Niven

Deflector  
  A means of pushing aside asteroids that get in the path of your space ship.  

First use of this term.

The blasters are those ravening beams of destruction which take care of recalcitrant meteorites in a spaceship's course when the deflectors can't handle them.
From The Ethical Equations, by Murray Leinster.
Published by Astounding Science Fiction in 1945
Additional resources -

Compare to the deflector shields in George Lucas' Star Wars. Also, compare to the earlier idea of a meteor-spotting radar from George O. Smith's 1943 short story Recoil.

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  More Ideas and Technology from The Ethical Equations
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