# Close to Critical

Canonical: https://www.bookquiver.com/hal-clement/close-to-critical/9780575110229

![Close to Critical](https://quivercdn.com/covers/gateway/hal-clement/close-to-critical_978-05-7511-022-9.jpg?v=2026-05-20%2007%3A57%3A26)

- Book: [Close to Critical](https://www.bookquiver.com/hal-clement/close-to-critical) ([Close to Critical.md](https://www.bookquiver.com/hal-clement/close-to-critical.md))
- Authors: [Hal Clement](https://www.bookquiver.com/hal-clement)
- Publisher: gateway
- Medium: ebook
- ISBN: 978-05-7511-022-9
- Published: 2011-09-29
- Language: en_GB
- Binding: E-book

## Description

Shrouded in eternal gloom by its own thick atmosphere, Tenebra was a hostile planet: a place of crushing gravity, 370-degree temperatures, a constantly shifting crust and giant drifting raindrops. Uncompromising - yet there was life, intelligent life on Tenebra. For more than twenty years, Earth scientists had studied the natives from an orbiting laboratory... and had even found a way to train and educate a few of them.