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Homo Sol

Homo Sol is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Homo Sol rather than just read about it. In short: "Homo Sol" is a science fiction short story by American writer Isaac Asimov. It was first published in the September 1940 issue of Astounding Science Fiction and reprinted in the 1972 collection The Early Asimov.

Key takeaways

  • Homo Sol belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Homo Sol to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Homo Sol from memory before moving on to harder problems.

Reference excerpt

"Homo Sol" is a science fiction short story by American writer Isaac Asimov. It 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 ("The Imaginary" and "The Hazing") 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.

Plot summary In the Homo Sol stories, the Galactic Federation has developed psychology into a hard science, with quantitative equations and solutions for behavior. Consequently, master psychologists are important and highly regarded. The Solarians (meaning humans, also 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 behavior 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.

Notes Asimov wrote "Homo Sol" in December 1939, after becoming certain that he would receive good grades in his first semester as a Columbia University graduate student. In January 1940 it was the second story, after 15 rejections, that John W. Campbell of Astounding Science Fiction purchased from him. While working at his family's candy store, when a customer berated him for inattention, stating that his son earned $50 a week from hard work, Asimov showed his $72 check, the largest in his career; "It was a very satisfactory moment", he later said. Campbell insisted on rewriting sections of "Homo Sol" to bring the story closer in line with his own racial views. Asimov avoided submitting future stories with alien characters to Astounding. "Homo Sol" also first mentioned the concept of psychology being developed into a mathematically rigorous science, an idea he called psychohistory in his Foundation stories.

References

External links Homo Sol title listing at the Internet Speculative Fiction Database

Worked examples

Example 1 — a first encounter with Homo Sol

Start with the simplest possible case. Write down what Homo Sol claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Homo Sol before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Homo Sol ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Homo Sol

In research
Homo Sol appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Homo Sol in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Homo Sol is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1940 English-language short stories, 1940 short stories, Fiction set around Alpha Centauri, so understanding it makes those chapters shorter.
In everyday life
Look for Homo Sol outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Homo Sol in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Homo Sol means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Homo Sol out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Homo Sol in simple terms?

"Homo Sol" is a science fiction short story by American writer Isaac Asimov. It was first published in the September 1940 issue of Astounding Science Fiction and reprinted in the 1972 collection The Early Asimov.

Why does Homo Sol matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Homo Sol?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Homo Sol.

Tags

  • 1940 English-language short stories
  • 1940 short stories
  • Fiction set around Alpha Centauri
  • Short stories by Isaac Asimov
  • Works originally published in Analog Science Fiction and Fact

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