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"I have a standard axiom: all governments lie. Don't believe anything they say. And corporations are only kinds of government."
- Frank Herbert

Planetary Defense  
  Keeping the Earth safe!  

As far as I know, the first use of this phrase in science fiction.

He had called a meeting of seven of us in his "workshop,” as he termed his experimental laboratory. There came Hul Jok, the gigantic Commander of the Forces of Planetary Defense; Mor Ag, who knew all there was to know about the types, languages and customs of the dwellers on every one of the major planets...
Technovelgy from When the Green Star Waned, by Nictzin Dyalhis.
Published by Weird Tales in 1925
Additional resources -

I can't think of an earlier depiction of the specific idea of defending the Earth from celestial bodies falling on it than in "The Day The Sky Exploded" ("La morte viene dallo spazio"), which came out in 1958.


('The Day the Sky Exploded' (1958))

At the end of the film, the Earth is saved from destruction by a giant meteor by repeated volleys of rockets.


(The finale of 'The Day the Sky Exploded' (1958))

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Additional resources:
  More Ideas and Technology from When the Green Star Waned
  More Ideas and Technology by Nictzin Dyalhis
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  Tech news articles related to works by Nictzin Dyalhis

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