A source-backed Rankhog guide to r/space: all 14 public rules, community context, posting fit, and 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
Rules can change, so Rankhog keeps verification dates and the original public Reddit sources visible.
The public description asks people to share and discuss informative content about astrophysics, cosmology, space exploration, planetary science, and astrobiology.
The old public sidebar encourages informative high-quality articles, news, and videos; publicly available peer-reviewed research papers and academic texts; and thoughtful text posts or open-ended questions that promote discussion. It also asks submitters to use original sources wherever possible.
r/space publishes 14 rules, all recorded in the structured list above. They cover topic relevance, accurate titles, source quality, prohibited campaign and social links, duplicates, image timing and credit, comment quality, simple questions, submission frequency, AI-generated content, and investing discussion.
For product-related drafts, read the spam/blogspam rule alongside the bans on direct crowdfunding, most social-media links, AI-generated content, and stock discussion. None of those restrictions becomes optional because a post is about space technology.
Use an original or top-level source and a descriptive, non-clickbait title. Strong source-backed fits include:
If the question is a straightforward who, what, or where question, use the pinned weekly Space Questions thread instead.
Do not submit sensationalized or unscientific material, blogspam, paywalled or pirated content, direct petitions or surveys, direct crowdfunding campaigns, most social-media links, duplicates, or re-hosted content. Do not use AI-generated images, art, text, or obviously AI-generated articles and videos.
Images and qualifying GIF-like media are limited to Friday, Saturday, and Sunday in UTC and can be restricted during high-traffic events. Credit every non-original image, including material from NASA or ESA. Comments must avoid low effort, memes, jokes, trolling, insults, and anti-scientific claims.
The five-submission limit is a ceiling, not a publishing target. r/LiDAR is related only when the subject connects remote sensing or laser-ranging work to planetary science or space exploration; otherwise use the more technically specific community.
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Treat direct promotion as high-risk. The public rules prohibit spam and blogspam, direct crowdfunding links, most social-media links, and content posted to influence stock performance. A source-backed scientific contribution must still satisfy every other rule.
The public sidebar encourages informative high-quality articles, news, videos, publicly available peer-reviewed research and academic texts, plus thoughtful text posts. Use original or top-level sources wherever possible.
Images, GIFs, and GIF-like videos under two minutes that do not rely on sound are allowed only on Friday, Saturday, and Sunday in UTC and can be restricted during high-traffic events. Low-effort, meme, and AI-generated images are prohibited at all times.
No. Rule 13 covers AI-generated images, artwork, and text, including text from tools such as ChatGPT. Articles and videos that are obviously AI-generated will also be removed.
Straightforward who, what, or where questions belong in the pinned weekly Space Questions thread. Open-ended, thought-provoking text posts are separately encouraged by the old public sidebar.