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r/nasa

r/nasa is an active safe-for-work Reddit community for space and astronomy with 5,882,842 members (#139 in our Top 1000) and about 8.4 new posts a day.

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Rank (SFW Top 1000)#139
Subscribers5.9M
Growth since Oct 19+926
Posts per day8.4
Posts all time64.8K
CreatedJul 2008
Visit r/nasa on Reddit ↗

About r/nasa

In its own words:

r/NASA is for anything related to the National Aeronautics and Space Administration; the latest news, events, current and future missions, and more.

The community was created on Jul 17, 2008, which makes it 18 years old. Since Oct 19, 2026, it has gained 926 subscribers (+0.02%). Among the 11 communities on our space and astronomy list it is number 2 by size.

Subscriber growth

5.88M5.88MSep 19Oct 29, 2026

Between Sep 19, 2026 and Oct 29, 2026, r/nasa went up from 5,878,915 to 5,882,842 subscribers (+3.9K, +0.07%). That is about 98 new members per day. The chart uses our weekly snapshots (8 so far), so it gets longer every week.

Top posts on r/nasa this week

The most upvoted posts of the past seven days, in the order Reddit ranks them (collected Oct 30, 2026).

  1. I designed and 3D printed a 60cm Saturn V cutaway to show the engineering inside!u/MeiloFeilo · Oct 25 · gallery
  2. Latest estimate for Starship launches required to support a Moon landing? 22.u/OrionPax2 · Oct 25 · link
  3. Had a great day at the Air and Space Museumu/creature_feature · Oct 29 · gallery
  4. Caltech Names Artemis II Commander Reid Wiseman as NASA JPL Deputyu/Aeromarine_eng · Oct 30 · link
  5. NASA’s Oldest Martian Spacecraft Have Been Running for Decades. Here’s Howu/wiredmagazine · Oct 27 · link
  6. Rare 1960’s snap 8 partsu/Urbanskiman88 · Oct 24 · gallery
  7. Got to spot the X-59 at Fort Worth NAS-JRB todayu/Ok-Sprinkles-696 · Oct 28 · image
  8. How will moonbase defend against meteorites?u/GrammmyNorma · Oct 28 · text post
  9. NASA’s Roman Space Telescope Enters Final Commissioning Phase - NASA Scienceu/Galileos_grandson · Oct 23 · link
  10. NASA’s Voyager 1 Conserves Power, Resolves Brief Communications Pause - NASA Scienceu/Galileos_grandson · Oct 29 · link

All-time top posts

The highest-ranked posts in the history of r/nasa, from 2018 to 2026, ranked by Reddit.

  1. What do they get paid?u/smokeysubwoofer · Apr 13, 2026 · image
  2. We've come a long way.May 30, 2020 · image
  3. NASA break room problems are different than most. Taken today @ JSC.u/Reesh26 · Apr 13, 2018 · 20,881 points · 338 comments · image
  4. Unfortunately my parents never sent this otherwise we would be colonizing Mars by nowu/aflakeyfuck · Feb 16, 2025 · image
  5. I always thought it was smaller.u/Schodog · Aug 2, 2018 · 17,662 points · 395 comments · image
  6. Last look at the Webb Telescopeu/joshtwid · Dec 25, 2021 · 17,646 points · 358 comments · image
  7. The end of NASAu/Tumbleweed-Artistic · Jun 25, 2025 · text post
  8. Apollo 17 & its destination in one stunning imageSep 1, 2024 · image
  9. Saw the other tattoo post and thought I'd share mine in honor of the upcoming launchAug 28, 2022 · 16,398 points · 332 comments · image
  10. Example of fuel consumptionu/TheMightyTroy10 · May 18, 2020 · video

What r/nasa talks about

Looking at the titles of 44 recent posts (Oct 21–Oct 28), the words that come up most are “space”, “artemis”, “moon”, “october” and “station”. Other frequent themes are future, lunar, mars, science, spacewalks and november. Recurring phrases include “space station”, “solar arrays”, “future lunar” and “space apps”. By format, 39% are links, 36% are text posts and 11% are images.

  • space 13
  • artemis 5
  • moon 5
  • october 4
  • station 4
  • future 3
  • lunar 3
  • mars 3
  • science 3
  • spacewalks 3
  • november 3
  • fit 3
  • solar 3
  • arrays 3
  • mission 2
  • team 2
  • apps 2
  • challenge 2

Popular post flairs: Question (14), Article (10), NASA (6), Video (4), News (3), Other (3).

Activity and best time to post

r/nasa gets about 8.4 new posts a day. The public archive holds 64,845 posts and 530,514 comments in total, about 8.2 comments per post. Last week the busiest day was Friday (7 posts) and the quietest was Thursday (5). Posting peaks around 12:00 UTC and is lowest around 00:00 UTC.

00: 00001: 102: 103: 10304: 005: 306: 00607: 008: 209: 10910: 111: 312: 71213: 314: 215: 21516: 117: 318: 31819: 120: 221: 22122: 223: 1
Posts per hour of the day, UTC, Oct 22, 2026 – Oct 28, 2026
Links 39%Text posts 36%Images 11%Videos 9%Galleries 5%

Rules of r/nasa

The moderators of r/nasa list 11 rules. In short:

  1. All submissions must be related to NASA
  2. Only images with content directly related to NASA are allowed
  3. Video submissions must come from an official NASA or related account
  4. No fundraising/merchant/petition links
  5. No clickbait / conspiracy theories
  6. No duplicate posts of the same event/subject
  7. No blogspam or websites with stolen/scraped content
  8. No low effort posts
  9. All submissions must be Safe For School
  10. Be kind to your fellow redditor

How to join

Open reddit.com/r/nasa 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 big is r/nasa?

r/nasa has 5,882,842 subscribers, which makes it the #139 safe-for-work subreddit in the SubMouse ranking. It added 3,927 members between Sep 19, 2026 and Oct 29, 2026.

When was r/nasa created?

r/nasa was created on Jul 17, 2008, so it has been around for 18 years.

Is r/nasa still active?

Yes. r/nasa gets about 8.4 new posts a day (average of the last four weeks). Over its lifetime the archive counts 64,845 posts and 530,514 comments.

What is the best time to post in r/nasa?

Based on post counts from Oct 22, 2026 to Oct 28, 2026, the busiest day was Friday and the quietest Thursday, and most posts arrive around 12:00 UTC, with the fewest around 00:00 UTC. More posts also means more competition, so a quieter hour can help a post get noticed.

What kind of posts are on r/nasa?

The community describes itself as: “r/NASA is for anything related to the National Aeronautics and Space Administration; the latest news, events, current and future missions, and more.” Recent post titles often mention space, artemis, moon, october and station. Most posts are links (39%).

Is r/nasa SFW?

Yes. Reddit does not mark r/nasa as an 18+ (NSFW) community. SubMouse lists safe-for-work subreddits only.

What are the rules of r/nasa?

Join the community on Reddit first, then use “Create post”. r/nasa accepts both text and link posts, with images, videos and galleries enabled. It has 11 posted rules, starting with: “All submissions must be related to NASA”; “Only images with content directly related to NASA are allowed”; “Video submissions must come from an official NASA or related account”. Moderators remove posts that break the rules, so read them in the sidebar before posting.

What subreddits are similar to r/nasa?

Communities with similar topics include r/space (28M), r/news (31.6M), r/Futurology (21.7M), r/nfl (12.9M) and r/science (34.6M).

Stats from public data (data updated Oct 29, 2026; activity, rules and archive totals via the Arctic Shift archive, Oct 30, 2026; top posts from Reddit’s public feeds). 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/nasa.