Until the 1950s, most radio science fiction stories were aimed at children. Shows like Superman, Buck Rogers and Flash Gordon were regular afternoon fare for the kids.
But science fiction magazines for adults were going strong in the early 1950’s. Titles like Fantasy and Science Fiction, Astounding Science Fiction, Fantastic Universe, and Amazing Science Fiction were popular.
Ray Bradbury, Kurt Vonnegut, Isaac Asimov, and many more legendary authors wrote for the pulp science fiction magazines.
In 1950, the NBC radio network created a new radio series of science fiction for adults, called Dimension X. It first aired on April 8th, 1950, and it ran until September 29, 1951. It made a return appearance as X Minus 1 from 1955 to 1958.
This story, Dwellers in Silence, was written by Ray Bradbury, and was a chapter in his novel The Martian Chronicles. It originally aired on July 19th, 1951.