r/SciFiConcepts is a subreddit with 29k members. The most common kinds of discussions are ideas and advice requests, and the community frequently discusses space, sci fi, technology, ai, and intelligence.
scifi ideas and concepts. These science fiction concepts can be based in hard sci-fi or can come from science fantasy. The only thing that matters is that the concepts could be reasonably found in a SF book, film or short story. If you have too many ideas to write about or are just looking for discussion then this is the right sub for you. Post your scifi concepts, ideas, plots and worldbuilding
Popular Themes in r/SciFiConcepts
#1
Ideas
: "If you had an advanced faster-than-light space craft with defenses, life support, endless supplies, and CRISPR-enhanced physical and cognitive abilities, where would you go first? Which planets or exoplanets would you visit? Would you ever return to Earth, or would you explore the universe forever?"
4 posts
#2
Advice Requests
: "Has anyone in history ever had an IQ and level of achievement similar to fictional geniuses like Rick Sanchez or Eddie Morra from Limitless? Obviously, no one has come close to them in terms of raw intelligence, but who in real life has come the closest — for example, someone like John von Neumann?"
2 posts
Popular Topics in r/SciFiConcepts
#1
Space
: "If you had an extremely advanced Spacecraft capable of safe, instantaneous travel to literally anywhere in Space, where would you go, and which planets or star systems would you visit? Would you ever return to Earth, or would you choose to live in Space indefinitely?"
31 posts
#2
Sci Fi
: "Imagine the Nystal: A telepathic device for your Sci Fi world"
22 posts
#3
Technology
: "They gave us Technology and we gave them our planet."
18 posts
#4
Ai
: "What if an Ai wasn’t programmed, but rAised like a child? That’s the world I’m building."
15 posts
#5
Intelligence
: "If an average person slept and woke up with genius-level Intelligence (like Limitless or Rick Sanchez), how quickly would they notice? What would they first perceive, and how would they test if they’ve really become that smart?"
12 posts
#6
Future
: "If you had an extremely advanced spacecraft capable of safe, instantaneous travel to literally anywhere in space, where would you go, and which planets or star systems would you visit? Would you ever return to Earth, or would you choose to live in space indefinitely?"
11 posts
#7
Aliens
: "Would Aliens think the same as us"
9 posts
#8
Consciousness
: "Theory: A journey into the past by Consciousness projection, based on fossil light from Earth"
9 posts
#9
Weapons
: "Expanding Universe and the Possible Consequences for Interstellar Travel"
8 posts
#10
Ftl
: "The Palimpsest Cosmos"
7 posts
Flair Used in r/SciFiConcepts
#1
Concept
: "The scariest generation ship scenario to me isn't the monster. It's the drift."
75 posts
#2
Question
: "If humans made first contact with an alien species, how could we effectively communicate with them?"
53 posts
#3
Story Idea
: "Weaponized linguistics"
35 posts
#4
Worldbuilding
: "What might humanity discover if Antarctica’s ice truly melted?"
34 posts
#5
Meta
: "Petition to ban LLM slop on this sub."
3 posts
Member Growth in r/SciFiConcepts
Yearly
+6k members(27.9%)
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Last updated: July 23, 2026