How to Write Sci-Fi

Hard vs. soft science fiction

Hard SF (Andy Weir, Kim Stanley Robinson, Greg Egan) commits to scientific plausibility — the physics has to hold. Soft SF (Ursula K. Le Guin, Becky Chambers) uses the future as a lens for sociology, psychology, and identity. Both are legitimate. Pick one before you start chapter one — the reader can feel the difference on page three.

The one big idea

Most great SF novels rest on a single load-bearing idea: faster-than-light travel costs you a piece of your memory, an AI achieves consciousness through grief, a generation ship's children mutiny against the mission their grandparents agreed to. Find your one idea, then write every chapter as if you are stress-testing it.

Worldbuilding that earns its keep

Build only what the story needs the reader to see. A working SF world is an iceberg — the reader feels the mass below the waterline without you naming every law. Use sensory detail (what does the food taste like, what does the light look like on this planet) instead of expository lore dumps.

Famous examples to study

Read Ursula K. Le Guin's The Left Hand of Darkness for sociological SF, Ted Chiang's Stories of Your Life and Others for idea-driven shorts, Andy Weir's Project Hail Mary for problem-solving structure, Becky Chambers's A Long Way to a Small, Angry Planet for character-first space opera, and N. K. Jemisin's The Fifth Season for SF/fantasy fusion.

Common tropes that still work

First contact, the generation ship, the AI awakening, time travel paradoxes, post-apocalyptic survival, the colony in revolt, the dystopia maintained by lies, the alien message. Tropes endure because they pose questions that don't get old.

Common mistakes to avoid

Dumping worldbuilding in chapter one, technology that solves whatever the plot needs, characters who exist only to admire the setting, ignoring the social consequences of your premise, and writing 'soft' SF with hard-SF rules (or vice versa) without committing. Pick a lane.

Five books to study

• The Left Hand of Darkness — Ursula K. Le Guin
• Project Hail Mary — Andy Weir
• A Long Way to a Small, Angry Planet — Becky Chambers
• The Fifth Season — N. K. Jemisin
• Stories of Your Life and Others — Ted Chiang

Tropes that still work

• First contact
• Generation ship
• AI awakening
• Time loop / time paradox
• Colony in revolt

Mistakes to avoid

• Front-loading worldbuilding
• Magic-wand technology that solves any plot problem
• Ignoring the social fallout of your premise
• Characters who only exist to admire the setting
• Mixing hard and soft SF without intention