Can I promote my space related product or startup here?
No. Promotion is banned here, and the spam rule plus the social media rule would remove a self promotion post almost immediately.
Subreddit guides
r/space rules, stats, and what to post
A source-backed Rankhog guide to r/space: public rules, community context, posting fit, and startup-promotion risk before you publish.
By Anthony Riera, founder and operator of Rankhog.
Subreddit guides combine public Reddit source URLs, captured rules, visible verification dates, and Rankhog's account-safety workflow.
Current public stats
- Members
- 27,976,454
- Verified
- September 29, 2026
- Category
- Science and space communities
Rules can change, so Rankhog keeps verification dates and the original public Reddit sources visible.
Rule summary
- Submissions must be related to Space/Cosmology: This includes "circlejerky" submissions or space-related art, with the exception of art from space agencies or historically-significant art.
- No sensationalist/misleading/unscientific content or titles: Post titles need to be descriptive and non-clickbait. When submitting images titles need to accurately describe the content of the image (e.g. if an image is a composite this needs to be clearly stated), and without attempting to draw in upvotes or comments. The image should stand on it's own.
- No spam/blogspam/paywalled/pirated content: This also means that news articles should be a top-level source.
- No petitions/surveys/crowdfunding: News articles about space-related crowdfunding campaigns are allowed, but direct links to crowdfunding campaigns, petitions or surveys are not allowed.
- No social media links: No social media links such as Facebook, Instagram, Twitter, etc. Exception: Twitter links are allowed for breaking news by official sources. This does not include YouTube videos, which are allowed as long as they follow the other rules.
- No duplicate or re-hosted content: No duplicate or re-hosted content
- Images are allowed only on weekend (and restricted during high-traffic events like Artemis): Images, gifs, and gif-like videos (those under 2 minutes and which don't rely on sound) are permitted only on weekends. No low-effort, meme, or AI generated images are permitted at any time.
- If an image is not OC you must give credit to the original photographer.: This applies even if the source is a space agency such as NASA or ESA.
- No low-effort/meme/joke/troll/insult comments: No low-effort/meme/joke/troll/insult comments
- No unscientific or anti-scientific comments: No unscientific or anti-scientific comments
- Straightforward questions belong in the Space Questions Thread: Straightforward questions (who/what/where) belong to the Weekly Space Questions thread (pinned at the top).
- Please limit yourself to no more than 5 submissions per 24 hour period.: More than 5 submissions in 24 hours
- No AI generated content: This includes both AI generated images/artwork and text generated by tools such as ChatGPT. Articles and videos that are obviously AI generated will also be removed.
- No discussion of stocks/investing: This includes discussions on which companies you should or should not invest in, articles purely covering the market performance of space IPOs, and any other content purely financial in nature or posted for the purpose of influencing a companies stock performance.
Works well
- A link post to a credible news article about a new mission, discovery, or agency announcement, with a plain descriptive title.
- A weekend image post of a genuine space photo, credited to the original photographer if it is not your own work.
- A substantive text post sharing real insight from your own work in the space field, written by you and not by AI.
- A YouTube video that is informative and follows all the other rules, since videos are explicitly allowed.
- A straightforward space question placed in the pinned weekly questions thread instead of a new post.
Avoid
- Posting your product link, landing page, or app announcement, because promotion is banned and the spam rule will catch it.
- Dropping a link to your tweet, Instagram post, or company blog, which trips “No social media links” and “No spam/blogspam/paywalled/pirated content”.
- Posting an image on a weekday, which breaks “Images are allowed only on weekend (and restricted during high-traffic events like Artemis)”.
- Uploading an AI generated image or asking ChatGPT to write your post, since “No AI generated content” removes both.
- Writing a clickbait title like you would never guess what NASA found, which violates “No sensationalist/misleading/unscientific content or titles”.
- Reposting an image someone else shot without crediting the photographer, which breaks “If an image is not OC you must give credit to the original photographer.” even for agency photos.
What r/space Is For
r/space is a community for sharing and discussing informative content on astrophysics, cosmology, space exploration, planetary science, and astrobiology. The people posting here are space enthusiasts, science readers, and people who follow missions, discoveries, and agency news. This is a topic community, not a business community, so the room is built around news, science, and images that teach people something. The rules make it clear the moderators want substance, and the description itself says informative content, which sets the tone for everything posted here.
Rules That Matter Before Posting
The first rule that decides survival is “Submissions must be related to Space/Cosmology”, so anything you post has to sit inside astrophysics, cosmology, space exploration, planetary science, or astrobiology. “No sensationalist/misleading/unscientific content or titles” means your title has to be plain and descriptive, with no clickbait. “No spam/blogspam/paywalled/pirated content” is the one that kills most marketing posts, because it demands news articles be a top level source and blocks blog reposts. “No social media links” blocks links to places like Twitter, Facebook, and Instagram, with an exception for Twitter links from official sources during breaking news, while YouTube videos are allowed if they follow the other rules. “No AI generated content” bans both AI images and AI written text, so do not draft your post with a chatbot. “Images are allowed only on weekend (and restricted during high-traffic events like Artemis)” means images, gifs, and short silent videos can only go up on weekends. “If an image is not OC you must give credit to the original photographer.” applies even when the photo comes from NASA or ESA. “No duplicate or re-hosted content” means you cannot repost something already posted or rehost someone else's work. “No petitions/surveys/crowdfunding” blocks direct links to surveys, petitions, and crowdfunding campaigns. “No discussion of stocks/investing” bans anything purely financial about space companies. Finally, “Straightforward questions belong in the Space Questions Thread” pushes simple who, what, and where questions into the pinned weekly thread.
What To Post
For a founder, the honest answer is that this is not a place to promote, so think of it as a place to share knowledge instead. A good post is a link to a credible news article about a space topic you genuinely care about, submitted as a top level source with a descriptive, non clickbait title. If you work in the space industry and have real news, a well written text post with substance can work, as long as it is informative and not an ad. If you want to share an image, save it for the weekend, make sure it is not a meme or AI generated, and credit the original photographer if it is not your own work. If you have a genuine question about space, put it in the pinned weekly questions thread rather than making a new post. The realistic play here is to participate as a reader and commenter, build a history of thoughtful contributions, and only post when you actually have something the community wants.
What To Avoid
Do not post anything off topic, because “Submissions must be related to Space/Cosmology” gets it removed. Do not use a clickbait or sensational title, because “No sensationalist/misleading/unscientific content or titles” removes it. Do not link your own blog, a paywalled article, or a social media post, because “No spam/blogspam/paywalled/pirated content” and “No social media links” both apply. Do not post images, gifs, or short videos on a weekday, because “Images are allowed only on weekend (and restricted during high-traffic events like Artemis)” restricts them to weekends. Do not post memes, low effort images, or AI generated images or text, because the image rule and “No AI generated content” ban them outright. Do not repost content or rehost someone else's image without credit, because “No duplicate or re-hosted content” and the photographer credit rule both apply. Do not link a survey, petition, or crowdfunding campaign, because “No petitions/surveys/crowdfunding” blocks direct links. Do not post about stock performance or which space company to invest in, because “No discussion of stocks/investing” bans purely financial content. Do not leave low effort, joke, troll, or unscientific comments, because those are banned too. Do not post a straightforward question as its own submission, because “Straightforward questions belong in the Space Questions Thread” sends those to the pinned weekly thread. And keep to the submission limit of no more than 5 posts per 24 hours.
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Common questions about r/space
Can I post an image of my product or a space themed graphic?
Only on weekends, only if they are not low effort, meme, or AI generated, and only with credit to the original photographer if the image is not yours.
Where do I ask a simple question about space?
Straightforward questions belong in the pinned Weekly Space Questions thread, not as their own post.
Can I post a YouTube video?
Yes, as long as the video follows the other rules, because the social media rule explicitly allows YouTube videos.
Can I use AI to write my post?
No. “No AI generated content” bans AI generated images and AI written text, so write it yourself.
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