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Homo Sol

Author	Isaac Asimov
Country	USA
Language	English
Series	Homo Sol Trilogy
Genre(s)	science fiction short story
Released in	Astounding Science Fiction
Publisher	Street & Smith
Media Type	Magazine
Released	September 1940
Followed by	The Imaginary

Homo Sol is a science fiction short story by Isaac Asimov that was first published in the September 1940 issue of Astounding Science Fiction and reprinted in the 1972 collection The Early Asimov. It deals with the proposed acceptance into a galactic federation of hominid civilizations of the hominids of newly discovered Earth. (Each member civilization is referred to by a prefix denoting its shared "hominidity", followed by the name of its star — hence the title, Homo Sol.)

Together with its two sequels, which form a 'Homo Sol Trilogy', the story is primarily set in a university environment. "Homo Sol" was the nineteenth story written by Asimov, the eighth to be published, and the second to appear in Astounding, which was then the world's leading science fiction magazine.

The Solarians (later referred to as Homo Sol) have developed hyperspace travel and landed on a planet of Alpha Centauri, thus qualifying for acceptance into the Galactic Federation of intelligent humanoid species.

Tan Porus, master psychologist at Arcturus University, is invited to join the delegation to be sent to administer the invitation, but sends one of his assistants. The delegation returns in despair; not only have the Solarians refused the invitation, but they exhibit irrational and war-like behaviour that contravenes the sacrosanct psychological laws established over millennia by Federation psychologists.

In opposition to his doubting colleagues, Porus insists that the hominids of this new planet are something special: a species susceptible to panic en masse. "What of Kraut's Law," a colleague asks him, "which says it is impossible to panic more than five hominids at a time?" Porus dismisses this with scorn, manipulates the Federation Council into sending him to Earth to demonstrate his thesis, and in a short time broadcasts back the results of his demonstration: "Panic, morons! World-wide panic!" Porus is eventually able to work out the psychological means to convince the Solarians to accept membership in the Federation.

In The Early Asimov, the author notes that Astounding editor John W. Campbell insisted on rewriting sections of "Homo Sol" to bring the story closer in line with his own racial views. In time, Asimov understood what Campbell was doing, and thereafter he avoided submitting stories with alien characters to Astounding. He also points out that in "Homo Sol" he first broached the concept of psychology being developed into a mathematically rigorous science, an idea he incorporated into his later Foundation stories.