r/universe↗
Universe: Astronomy, Cosmology, Orbital Mechanics...
The Universe is a forum for sharing and discussion of Astronomy, Astrophotography, Astrophysics & Cosmology.
81k subscribers238 posts / mo in Sep 2026 (incl. <1% by known bots)173 authors / mosince 2009
r/universe has 81k members. It gets about 238 posts a month from 173 people. Top topics: Big Bang Theory, Black Holes and Galaxy Exploration.
When to post on r/universe
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How r/universe has grown
Subscriber growth
Subscribers over time
Monthly activity
Posts, comments and authors per month
Topics and brands on r/universe
Top topics
Share of the subreddit's posts
- Big Bang Theory3.1%
- Black Holes1.2%
- Galaxy Exploration1.0%
- Galaxy Observations1.0%
- Milky Way Galaxies0.9%
Brands people mention
Most-mentioned brands and sites, last 12 months
- arXiv.org e-Print archive
- Doi
- NASA
- Zenodo
- Space
Everything else about r/universe
Posting rules and account requirements, how often posts get removed, who writes here (age, gender, countries), what people ask for, how they talk, and related subreddits — all in the full report.
Posts and activity for Sep 2026. Members from Reddit's subscriber counts. Read from the same data the app runs on. Our research