r/Astronomy↗
The amateur hobby of humanity since the dawn of time and scientific study of celestial objects.
3.2M subscribers769 posts / mo in Sep 2026506 authors / mosince 2008
r/Astronomy has 3.2M members (+4.0% over the last 12 months). It gets about 769 posts a month from 506 people. Top topics: Telescope Buying Guide, Milky Way Galaxies and Telescope Newbies & Builds.
When to post on r/Astronomy
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How r/Astronomy has grown
Subscriber growth
Subscribers over time
Monthly activity
Posts, comments and authors per month
Topics and brands on r/Astronomy
Top topics
Share of the subreddit's posts
- Telescope Buying Guide1.0%
- Milky Way Galaxies0.6%
- Telescope Newbies & Builds0.6%
- Saturn Photography0.5%
- Astrophotography Equipment and Techniques0.5%
Brands people mention
Most-mentioned brands and sites, last 12 months
- NASA
- AstroBin
- arXiv.org e-Print archive
- Space
- Astrometry
Everything else about r/Astronomy
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