About r/spacex
In its own words:
Welcome to r/SpaceX, the premier SpaceX discussion community and the largest fan-run board on the American aerospace company SpaceX. We recommend using r/SpaceX with Old Reddit. This board is not an official outlet for SpaceX information."
Community guide
r/spacex (#270, about 3.7 million) is a large unofficial SpaceX fan discussion board (recommends Old Reddit; not an official outlet). Rules ask whether posts promote civil substance, relate directly to SpaceX, add meaningful new info, support serious technical talk (especially Technical flair), and use clean titles/links/format. Link/Video (~6.4 ppd).
Serious SpaceX substance
On-topic, meaningful SpaceX discussion—not drive-by hype without content.
Technical threads stay technical
Technical-flair threads expect thoughtful technical comments; titles/links should be clean.
Practical pointers
Link-leaning samples; Starship flair appeared in the window.
SubMouse Editorial
The community was created on Aug 22, 2011, which makes it 15 years old. Since Oct 26, 2026, it has gained 411 subscribers (+0.01%). Among the 12 communities on our space and astronomy list it is number 3 by size. It sits just behind r/PeterExplainsTheJoke (#269) and ahead of r/MMA (#271) in our ranking.
What sets r/spacex apart
Posts here spark a lot of conversation: the archive averages 39.6 comments per post, roughly 2.8× the typical big subreddit (14.0). Relative to its huge audience, posting is calm — around 1.7 new posts a day per million members, which puts it in the quietest fifth of the Top 100. A good post has less competition here.
Subscriber growth
Between Sep 19, 2026 and Nov 2, 2026, r/spacex went up from 3,698,005 to 3,700,892 subscribers (+2.9K, +0.08%). That is about 66 new members per day. The chart uses our weekly snapshots (9 so far), so it gets longer every week.
What r/spacex talks about
We read the titles of 20 recent posts (Oct 29–Nov 4), the words that come up most are “space”, “nasa”, “launch”, “problem” and “agency”. Other frequent themes are starbase, flight, starship, updates, starlink and china. Recurring phrases include “space agency” and “artemis program”. By format, 65% are links, 15% are videos and 10% are images.
Activity and best time to post
r/spacex gets about 6.4 new posts a day. The public archive holds 60,757 posts and 2,405,450 comments in total, about 39.6 comments per post. Last week the busiest day was Thursday (6 posts) and the quietest was Wednesday (1).
Rules of r/spacex
The moderators of r/spacex list 6 rules. In short:
- Does it promote a healthy community and a civil discussion on the substance of the issue?
- Is the post directly related to SpaceX? Is the comment on-topic?
- Does the post contribute meaningful new information or questions to the community?
- Does the post contribute to a serious, thoughtful and technically-oriented discussion?
- Do comments in a 'Technical' flair thread contribute to a serious and thoughtful discussion?
- Does the post have a good title, a clean link and the right format, and doesn't belong in a thread?
How to join
Open reddit.com/r/spacex and press “Join”. Read the community rules in the sidebar before you post: every subreddit is run by its own volunteer moderators.
Frequently asked questions
How many subscribers does r/spacex have?
r/spacex has 3,700,892 subscribers (Nov 2, 2026), which makes it the #270 safe-for-work subreddit in the SubMouse ranking. It added 2,887 members between Sep 19, 2026 and Nov 2, 2026.
How old is r/spacex?
r/spacex was created on Aug 22, 2011, so it has been around for 15 years.
How active is r/spacex?
Moderately: r/spacex gets about 6.4 new posts a day (average of the last four weeks). Over its lifetime the archive counts 60,757 posts and 2,405,450 comments.
When is r/spacex most active?
Based on post counts from Oct 29, 2026 to Nov 4, 2026, the busiest day was Thursday and the quietest Wednesday. More posts also means more competition, so a quieter hour can help a post get noticed.
What is r/spacex about?
The community describes itself as: “Welcome to r/SpaceX, the premier SpaceX discussion community and the largest fan-run board on the American aerospace company SpaceX. We recommend using r/SpaceX with Old Reddit. This board is not an official outlet for …” Recent post titles often mention space, nasa, launch, problem and agency. Most posts are links (65%).
Is r/spacex safe for work?
Yes. Reddit does not mark r/spacex as an 18+ (NSFW) community. SubMouse lists safe-for-work subreddits only.
How do I post on r/spacex?
Join the community on Reddit first, then use “Create post”. r/spacex accepts both text and link posts, with images and videos enabled. It has 6 posted rules, starting with: “Does it promote a healthy community and a civil discussion on the substance of the issue?”; “Is the post directly related to SpaceX? Is the comment on-topic?”; “Does the post contribute meaningful new information or questions to the community?”. Moderators remove posts that break the rules, so read them in the sidebar before posting.
Which communities are like r/spacex?
Communities with similar topics include r/PremierLeague (5.1M), r/boardgames (5.5M), r/anime (14.5M), r/nflmemes (1.2M) and r/hockey (3.1M).
Stats from public data (data updated Nov 2, 2026; activity, rules and archive totals via the Arctic Shift archive, Nov 6, 2026). Point and comment counts are archive snapshots and can be lower than on Reddit today. SubMouse is an independent directory and is not affiliated with Reddit or the moderators of r/spacex.