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Inconstant Moon

Inconstant Moon 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 Inconstant Moon rather than just read about it. In short: Inconstant Moon is a science fiction short story collection by American author Larry Niven that was published in 1973. "Inconstant Moon" is also a 1971 short story that is included in the collection. The title refers to "O, swear not by the moon, th' inconstant moon", a quote from the balcony scene in William Shakespeare's Romeo and Juliet.

Inconstant Moon — main illustration
Inconstant Moon — illustration

Key takeaways

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

Reference excerpt

Inconstant Moon is a science fiction short story collection by American author Larry Niven that was published in 1973. "Inconstant Moon" is also a 1971 short story that is included in the collection. The title refers to "O, swear not by the moon, th' inconstant moon", a quote from the balcony scene in William Shakespeare's Romeo and Juliet. The collection was assembled from the US collections The Shape of Space and All the Myriad Ways.

Story synopses (Sphere paperback edition) The 1974 Sphere paperback version of the collection only contained seven of the twelve stories originally included in the 1973 Gollancz hardback edition.

"Inconstant Moon" First appearance: 1971 short story collection All the Myriad Ways. The short story won the 1972 Hugo Award for best short story. Stan, the narrator, notices that the Moon is glowing much brighter than ever before. The people he meets as the story begins all praise the Moon's increased beauty but lack the scientific background to understand its cause. However the narrator surmises that the Sun has gone nova, the day side of the Earth is already destroyed, and this is the last night of his life. He then calls and visits his girlfriend Leslie, presuming her ignorant of the situation, but she realizes it independently when Jupiter brightens with appropriate delay; they then enjoy their last night on the town, before rain and winds start. Later, he realizes one other possibility. In case he is right, they find appropriate supplies and seek refuge from the coming natural disasters in Leslie's high-rise apartment. The second possibility turns out to be correct: the Earth has "merely" been struck by an enormous superflare—by far the worst disaster in human history, with most (if not all) people in the Eastern Hemisphere presumed dead, but humans in the Americas have a chance of surviving the cataclysm. The vaporized seawater leads to torrential rains, hurricanes and floods. The story ends at the break of an overcast, gray morning, with Leslie's apartment becoming an island among the raging flood waters, but with the narrator rather optimistically wondering "if our children would colonize Europe, or Asia, or Africa." In 1996, the story was made into an episode of The Outer Limits television series written by Brad Wright. Jo Walton in 1997 wrote a short poem, "The End of the World in Duxford", as "an unauthorised version of 'Inconstant Moon', a British equivalent."

"Bordered in Black" First appearance: The Magazine of Fantasy & Science Fiction, April 1966. A prototype faster-than-light spacecraft crewed by two men is sent to the Sirius system, known from robotic exploration to include a terrestrial world. In orbit around the world, they notice that one of the continents has a thin, strange border all the way around its coastline, which radiates a low heat and appears black in visible light. After exploring the edges of the smaller continents, and discovering that the ocean hosts only one lifeform—a single species of algae that they think might have been genetically engineered—they decide to explore the large continent with the border. When they discover just what the black border is—a seething mass of trapped humans with very dark skin, feeding off the algae and each other—the result is the death, by suicide, of one of the crew, and the self-destruction of the ship by the traumatized survivor upon his return to Earth—and a chilling reminder that there may be great danger waiting for further human explorers. The story ends on a hopeful note, with the project leader believing that Earth can help the humans at Sirius, and a fearful one, with the crewman then speculating that the humans were seeded by carnivorous aliens as food animals. In the notes to his collection Convergent Series, Niven wrote that "Bordered in Black"

does not belong to the Known Space universe. (...) When I wrote Bordered in Black, Known Space had not taken form. I was playing with some preliminary ideas, and one of these – the "Blind Spot" effect of this form of faster-than-light travel – was later incorporated into Known Space. But it's a different timeline entirely. Similar statements hold for "One Face" (...) Hair styles and human colony worlds from this story later entered Known Space; but the story does not belong to that universe.

"How the Heroes Die" First appearance: Galaxy Science Fiction, October 1966. A Known Space story. The 15-man team setting up the first base on Mars experience tragedy when a murder is committed. Carter, the homophobic murderer, in the process of escaping on one of the transportation buggies crashes through the plastic bubble which holds in the base's atmosphere in an attempt to kill everyone else; however, it fails, and he is soon chased by Alf, the brother of the victim on another buggy. Carter had committed the murder because the victim had asked Carter for homosexual sex. Alf suggests to Carter that he himself is in denial about his own homosexuality. The lethal chase, with the two combatants in constant radio communication, slowly reveals the community stresses which resulted in the murder. Alf wants to kill Carter in revenge for his brother, while Carter wishes the same and to try once more to destroy the base; but with limited oxygen in their tanks, the two men must ensure that they have enough left to return to base.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Inconstant Moon

Start with the simplest possible case. Write down what Inconstant Moon 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 Inconstant Moon 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 Inconstant Moon 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 Inconstant Moon

In research
Inconstant Moon 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 Inconstant Moon 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
Inconstant Moon is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1971 English-language short stories, 1971 short stories, 1973 English-language short story collections, so understanding it makes those chapters shorter.
In everyday life
Look for Inconstant Moon 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 Inconstant Moon in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Inconstant Moon 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 Inconstant Moon out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Inconstant Moon in simple terms?

Inconstant Moon is a science fiction short story collection by American author Larry Niven that was published in 1973. "Inconstant Moon" is also a 1971 short story that is included in the collection. The title refers to "O, swear not by the moon, th' inconstant moon", a quote from the balcony scene…

Why does Inconstant Moon 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 Inconstant Moon?

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 Inconstant Moon.

Tags

  • 1971 English-language short stories
  • 1971 short stories
  • 1973 English-language short story collections
  • 1973 short story collections
  • Fiction about faster-than-light travel
  • Fiction about supernovae
  • Fiction about the Sun
  • Hugo Award for Best Short Story–winning works
  • Short stories by Larry Niven
  • Short stories set on Mars
  • Short stories set on Venus
  • Short stories set on the Moon

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