Winner of the Hugo and SFWA Grand Master Awards
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.
Hal Clement (1922-2003) graduated from Harvard and held degrees in astronomy, chemistry and education. A former B-24 pilot, he worked for most of his life as a high-school science teacher. He gained his reputation as an SF writer in ASTOUNDING and MISSION OF GRAVITY first appeared there in 1953.