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"Real science opens windows for us to look through. We're right at the footsteps of the most interesting scientists around."
- Larry Niven

Planet-Smasher  
  Devices capable of destroying an entire planet.  

The crew of light cruiser Kennessee was sent to examine the alien star system to look for the Space Assassins.

[Kennessee] was spying out the ground for what would be - if she was successful - the monstrous destruction of an entire race by planet-smasher guided missiles and the merciless weapons of an Earth fleet. The men did not like it. They'd hoped that some other ship would be the one to with success in its search.
From Propagandist, by Murray Leinster.
Published by Astounding Science-Fiction in 1947
Additional resources -

See planet-buster for a similar reference from a 1956 yarn.

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  More Ideas and Technology from Propagandist
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