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r/sciencefiction

Science Fiction. This reddit is for fans and creators of Science Fiction and related media in any form. SF topics should involve plausible ideas reached through the rational application of science. General speculative fiction posts are fine as long as they primarily focus on Science Fiction. Founded 2010 · 317.7K members

317.8K members. The best post we have captured here reached 17.1K upvotes, which works out to 54 per 1,000 members.

54peak upvotes per 1,000 members
317.8Kmembers
17.1Kbest post
4.5Kmost comments
498posts we track

Open r/sciencefiction on Reddit ↗

What actually lands here

The mix of post types among everything we have captured. Posting a link where almost nothing but images lands is wasted effort, and this is the fastest way to see it.

32% 30% 15% 12%
Image 32% Text 30% Question 15% Video 12% Gallery 7% Link 4%

What the ceiling looks like

The biggest posts we have captured here. Links go to the original on Reddit.

What do you consider peak science fiction? The best of the best?

↑ 17.1K 💬 4.5K image 2024

Oblivion was ahead of it's time

↑ 10.7K 💬 193 image 2026

Time travel is more complicated than you think

↑ 5.7K 💬 346 image 2025

Equilibrium (2002) "Not without incident".

↑ 5.4K 💬 588 video 2024

Corporate America aids criminals while privatizing the police force

↑ 5.3K 💬 50 image 2025

During the day of the filming of this scene in Alien (1979), a crew member asked Ridley Scott why there was water dripping inside a spaceship to whic…

↑ 5K 💬 204 image 2026

What quotes from science fiction could we learn from in the "real" world?

↑ 4.5K 💬 222 image 2025

Gunbuster is the first sci-fi animation I've ever see portray accurate extreme-range combat, with Laser weaponry Firing on Targets 1.8 Light-Seconds …

↑ 4K 💬 153 video 2026

Aliens Won’t Bother Contacting Earth, There’s No Sign Of Intelligence, Fermi Paradox Solution Suggests

↑ 3.4K 💬 319 link 2025

I have no idea what to read, but I’d like to know what not to read.

↑ 3.3K 💬 1.4K image 2025

Communities its size

Within four times the member count either way, so the comparison is fair. Sorted by upside.

r/sciencefiction, in numbers

Answered from the posts ViralHunt holds from this community, not from Reddit's own about page.

What is r/sciencefiction?
r/sciencefiction ("Science Fiction") describes itself this way: This reddit is for fans and creators of Science Fiction and related media in any form. SF topics should involve plausible ideas reached through the rational application of science. General speculative fiction posts are fine as long as they primarily focus on Science Fiction. It was founded in 2010 and has 317.7K members.
How many members does r/sciencefiction have?
r/sciencefiction has about 317.8K members. ViralHunt has tracked 498 of its posts; the biggest reached 17.1K upvotes, which is 54 per 1,000 members.
What is the most viral post on r/sciencefiction?
"What do you consider peak science fiction? The best of the best?" reached 17.1K upvotes and 4.5K comments in 2024, the highest score among the posts we hold from r/sciencefiction.
What subreddits are similar to r/sciencefiction?
Communities of a comparable size we track: r/FBI, r/Trumpvirus, r/alaska, r/Louisiana, r/popculture, r/Antimoneymemes.
What kind of posts do best on r/sciencefiction?
Of the posts we hold, 32% are image posts and 30% are text posts.
When is the best time to post on r/sciencefiction?
Across 498 timestamped posts we hold, the slots whose posts averaged the highest score are Saturday at 14:00 UTC (5.8K avg upvotes), Thursday at 09:00 UTC (2.3K avg upvotes), Monday at 15:00 UTC (1.7K avg upvotes). The busiest day is Sunday. For Reddit as a whole, see the best time to post on Reddit page.
How many upvotes does a post need to reach the top of r/sciencefiction?
The 20th-best post we hold from r/sciencefiction has 2.4K upvotes, so that is roughly the bar for the top twenty. We captured 102 posts from it in the last 30 days.

See what is climbing here before you write

ViralHunt tracks Reddit and eight other networks, records how every post grows, and puts what is taking off in front of your team in one list.

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Every figure here is what ViralHunt has captured from r/sciencefiction, not everything the community has ever posted. We deliberately do not publish an average score: our sample is weighted toward a community's best posts, so an average would be flattering and wrong. Peak per 1,000 members is computed the same way for every community listed. See how we measure.