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Close to Critical - Clement, Hal, and Clement, Rod
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Tenebra has a gravity three times that of Earth, a day temperature at the equator of 380 degrees centigrade, an atmosphere of water mixed with other chemicals, and a constantly shifting crust. There is life, with intelligence, on the planet, and a scientific expedition has been attempting to make contact. The scientists have devised a remote-controlled unit that lands on the planet, takes away 10 youngsters from their tribe and teaches them to communicate with it - then, when they have grown up, they will be the means of ...

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Close to Critical 1980, Del Rey Books

ISBN-13: 9780345291684

Mass-market paperback

Close to Critical 1975, Ballantine Books

ISBN-13: 9780345245083

Mass-market paperback

Close to Critical 1970, Ballantine Books

ISBN-13: 9780345219497

Mass-market paperback