r/askastronomy↗
Ask Astronomy
For your astronomy-related questions and content!
186k subscribers396 posts / mo in Sep 2026315 authors / mosince 2012
r/askastronomy has 186k members (+38% over the last 12 months). It gets about 396 posts a month from 315 people. Top topics: Telescope Buying Guide, Space & Physics Engineering and Milky Way Galaxies.
When to post on r/askastronomy
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How r/askastronomy has grown
Subscriber growth
Subscribers over time
Monthly activity
Posts, comments and authors per month
Topics and brands on r/askastronomy
Top topics
Share of the subreddit's posts
- Telescope Buying Guide1.0%
- Space & Physics Engineering0.8%
- Milky Way Galaxies0.8%
- Solar System Scale & Planets0.8%
- Interstellar Objects & Stars0.7%
Brands people mention
Most-mentioned brands and sites, last 12 months
- NASA
- Astrometry
- arXiv.org e-Print archive
- xkcd
- Institute of Physics
Everything else about r/askastronomy
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