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Orphans of the Sky is a science fiction novel by Robert A. Heinlein, consisting of two parts: "Universe" and its sequel, "Common Sense". The two novellas were first published together in book form in 1963. "Universe" was also published separately in 1951 as a 10¢ Dell paperback. These works contain one of the earliest …

Off the Main Sequence: The Other Science Fiction Stories of Robert A. Heinlein is a collection of 27 Robert A. Heinlein short stories, including three that Heinlein never collected in book form. The title is a play on the astronomy concept off the main sequence.