The Invaders, published in 1942 in Astounding Science-Fiction

“The Invaders” also published as “Behind the Black nebula” by L. Ron Hubbard

Publication date: January 1942

Original publication: Astounding Science-Fiction

Genre: Science Fiction

Story description: Far into the future, a Science Corp technician makes a monumental discovery that saves the lives of men condemned to work in the Crystal Mines of the Black Nebula.

Currently available as part of the Stories from the Golden Age series, in the title Beyond All Weapons.