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.
Time Enough for Love is a science fiction novel by Robert A. Heinlein, first published in 1973. The work was nominated for the Nebula Award for Best Novel in 1973 and both the Hugo and Locus Awards in 1974.
The Worlds of Robert A. Heinlein is a collection of science fiction short stories by Robert A. Heinlein published in 1966. It includes an introduction entitled "Pandora's Box" that describes some of the difficulties in making predictions about the near future. Heinlein outlines some of his predictions that he made in …