A short, curated guide — not an automatic related dump. Figures come from SubMouse's safe-for-work directory when we have them.
r/space covers informative astrophysics, cosmology, exploration and planetary science. Hobby observing and imaging have dedicated rooms with different norms.
Decorative “space” aesthetic related hits are omitted.
Stay on space for science/exploration articles and discussion. Use Astronomy for amateur observing culture and astrophotography for sharing amateur space images.
r/space — /r/space: news, articles and discussion
Share & discuss informative content on: * Astrophysics * Cosmology * Space Exploration * Planetary Science * Astrobiology
Astronomy
When to choose it: You care about observing, amateur practice and celestial hobby talk.
Why it is here: Topical sibling. Public description: amateur hobby and scientific study of celestial objects.
How it differs from r/space: Hobby/observing emphasis versus mission/science news mix on space.
Amateur Astrophotography
When to choose it: You are sharing or discussing amateur space photography.
Why it is here: Topical sibling. Public description celebrates amateur astrophotography and member work.
How it differs from r/space: Imaging craft versus general space science.
Run the automatic finder for r/space (results are matched from our directory; that page is not indexed): Find related to r/space.
Members and public descriptions come from SubMouse's safe-for-work directory (as of 2026-11-02 UTC); 7-day growth measured from 2026-10-26. Posts/day and culture claims appear only when we have them — missing fields stay n/a. Directory rank is listing order. Communities outside the published Top 100 open in the info tool instead of a full community page. Guide updated 2026-11-06.