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Ivan's Hammer refers to the theoretical use of a natural asteroid or meteoroid as a Weapon of Mass Destruction in a first-strike role. The concept can be traced back to the 1960s. During the late 1950s and early 1960s a number of science fiction writers used the concept in story ideas, most notably Robert Heinlein in The Moon is a Harsh Mistress where a rebellious Lunar colony uses large payloads of mined ore to bombard Earth from the Moon.
- Aviation Week and Space Technology, January 29, 1962, page 89
- "Pale Blue Dot". Sagan, Carl. Headline Book Publishing 1995. ISBN 0-7472-1553-7