![]() ![]() ![]() However, the costs of operating the technology mean that colony planets remain isolated from Earth until they can produce something to justify two-way trade. The novel's setting involves a future when Malthusian overpopulation on Earth has been averted by the invention of teleportation, called the "Ramsbotham jump", which can send Earth's excess population to colonize other planets. The themes of the work include the difficulties of growing up and the nature of man as a social animal. The story describes a group of students sent on a survival test to an uninhabited planet, who soon realise they are stranded there. ![]() Heinlein, published in 1955 by Scribner's as one of the Heinlein juveniles. Tunnel in the Sky is a juvenile science fiction novel by American writer Robert A. ![]()
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