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Science Fiction, Fantasy & Horror Books

Close to Critical

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Close to Critical

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Author: Hal Clement
Publisher: Street & Smith Publications, Inc., 1964
Series: Mesklin: Book 2

1. Mission of Gravity
2. Close to Critical
3. Star Light

Book Type: Novel
Genre: Science-Fiction
Sub-Genre Tags: First Contact
Hard SF
Space Exploration
Avg Member Rating:
(16 reads / 9 ratings)


The Tenebrans are intelligent, but primitive by human standards. Yet scientists from Earth have found ways to train and educate some of the Tenebrans. This training becomes crucial when two beings-a young girl from Earth and the son of an alien diplomat-are marooned in a bathyscape that is headed toward the surface of the planet, where neither can hope to survive.


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