Time for the Stars is a science fiction novel by Robert A. Heinlein published by Scribner's in 1956 as one of the Heinlein juveniles. The basic plot line is derived from a 1911 thought experiment in special relativity, commonly called the twin paradox, proposed by French physicist Paul Langevin. The story bears many similarities in plot and concepts to Variable Star written by Spider Robinson from an incomplete outline created by Heinlein around the time this book was written, and published in 2006.
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