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The Ultimate Weapon is a science fiction novel by John W Campbell Jr., first published in 1936. The novel was originally published as a serial in Amazing Stories under the title of Uncertainty.

The star Mira was unpredictably variable. Sometimes it was blazing, brilliant and hot. Other times it was oddly dim, cool, shedding little warmth on its many planets. Gresth Gkae, leader of the Mirans, was seeking a better star, one to which his "people" could migrate. That star had to be steady, reliable, with a good planetary system. And in his astronomical searching, he found Sol.

With hundreds of ships, each larger than whole Terrestrial spaceports, and traveling faster than the speed of light, the Mirans set out to move in to Solar regions and take over.

And on Earth there was nothing which would be capable of beating off this incredible armada—until Buck Kendall stumbled upon THE ULTIMATE WEAPON.

John W Campbell Jr., (1910-1971) was an American science fiction writer and editor. As editor of Astounding Science Fiction (later called Analog Science Fiction and Fact) from late 1937 until his death, he is generally credited with shaping the so-called Golden Age of Science Fiction.