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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 …

Podkayne of Mars is a science fiction novel by Robert A. Heinlein, originally serialised in Worlds of If, and published in hardcover in 1963. The novel is about a teenage girl named Podkayne "Poddy" Fries and her younger, asocial genius brother, Clark, who leave their home on Mars to take a trip on a spaceliner to …