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Enter any two safe-for-work communities. We’ll place their public descriptions, members, growth, topics and collected rule titles side by side — instantly, from data we already have.

r/Astronomy vs r/astrophotography

Side-by-side using public descriptions, members, growth and rule titles from SubMouse. Missing fields show as n/a. Adult communities are excluded.

Swap sides New comparison Related to r/Astronomy Related to r/astrophotography

Astrophoto shares vs astronomy discussion

r/astrophotography celebrates amateur astrophotography and sharing original work of real astronomical objects. r/Astronomy describes the hobby and scientific study of celestial objects more broadly.

In our directory, Astronomy is larger (about 3.2M, rank #333) than astrophotography (about 2.6M, rank #422). Activity samples are similar in volume (~30 vs ~25 posts/day). astrophotography’s sample is overwhelmingly images (nebulae, DSOs, lunar, galaxies); Astronomy’s sample mixes images with text and links, including astrophotography OC and discussion flairs. Our directory lists each name among the other’s related communities.

Rule titles: astrophotography requires real original amateur work plus acquisition/processing info; Astronomy has separate lanes for pictures, object ID, questions, telescope help and bans misinformation.

  • Choose r/astrophotography to share original amateur sky photos with gear and processing details.
  • Choose r/Astronomy for broader questions, object ID, telescope help and mixed astronomy discussion.
  • Both sit outside the current Top 100 cut; space-vs-astronomy is a separate curated pair on SubMouse.

Written comparison based on public descriptions and rule titles · updated 2026-11-07.

r/Astronomy

Astronomy

The amateur hobby of humanity since the dawn of time and scientific study of celestial objects.

Members
3.2M
7-day growth
+1.5K
Posts/day
25.2
Directory rank
#333
Created
Mar 28, 2008
Submissions
Text or links

Sample mix: images 48%, text posts 28%, galleries 11%

Topics: Space & Astronomy

Rule titles (short names we collected)

  • Pictures & Videos
  • Object Identification
  • Questions
  • Telescope Help
  • Content
  • Behavior
  • Sources
  • Repetition & Relevance
  • Misinformation & Pseudoscience
  • Minimum Karma
  • Post Types

Open r/Astronomy on SubMouse

About this community: r/Astronomy (#333, about 3.2 million) covers amateur astronomy and scientific study of celestial objects. Collected rules cover Pictures & Videos; Object Identification; Questions; Telescope Help. Sample ~25.2 ppd (168 posts). Sample mix: image:80, text:47, gallery:19, link:12.

r/astrophotography

Amateur Astrophotography

/r/astrophotography celebrates amateur astrophotography and will primarily focus on sharing and discussing the work of our members. We encourage sharing original content of real astronomical objects as a means of showca…

Members
2.6M
7-day growth
+331
Posts/day
30.4
Directory rank
#422
Created
Oct 23, 2009
Submissions
Text or links

Sample mix: images 90%, text posts 6%, videos 3%

Topics: Photography

Rule titles (short names we collected)

  • Post Types
  • Real Astrophotography and Equipment Images Only
  • Original and Amateur Content Only
  • Post Titles
  • Acquisition and Processing Information
  • General Etiquette

Open r/astrophotography on SubMouse

About this community: r/astrophotography (#422, about 2.6 million) showcases amateur astrophotography of real astronomical objects. Catalogue description: /r/astrophotography celebrates amateur astrophotography and will primarily focus on sharing and discussing the work of our members. We encourage sharing original content of real astronomical objects as a means of showcasing that work with those who enjoy astrophotography, inspiri

Supported differences

Aspectr/Astronomyr/astrophotography
Public focus (from each community’s public description) The amateur hobby of humanity since the dawn of time and scientific study of celestial objects. /r/astrophotography celebrates amateur astrophotography and will primarily focus on sharing and discussing the work of our members. We encourage sharing original content of real astronomical objects as a means of showca…
Size
r/Astronomy is larger in our directory.
 3.2M members 2.6M members
Posting activity (our sample) 25.2/day 30.4/day
Common post types in our sample images 48%, text posts 28%, galleries 11% images 90%, text posts 6%, videos 3%
Topic tags on SubMouse Space & Astronomy Photography
Selected rule titles (short names we collected) Pictures & Videos; Object Identification; Questions; Telescope Help; Content Post Types; Real Astrophotography and Equipment Images Only; Original and Amateur Content Only; Post Titles; Acquisition and Processing Information

What they share

  • Our directory lists each of these communities on the other’s related list.

Rules and posting patterns we can verify

astrophotography short titles: post types; real astrophotography and equipment images; original and amateur content only; post titles; acquisition and processing information; general etiquette. Our sample flairs include nebulae, DSOs, lunar, galaxies and planetary.

Astronomy: pictures and videos; object identification; questions; telescope help; content; behavior; sources; repetition and relevance; misinformation and pseudoscience; minimum karma; post types.

Where this comparison comes from

Public descriptions and member counts from SubMouse’s safe-for-work directory. Short rule titles and activity samples SubMouse collected. Mutual related-list links. Short titles only.

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 post-type mixes appear when we have an activity sample. Rule lines are short titles, not the full sidebar. Directory rank is listing order — communities outside the current Top 100 open in the info tool instead of a full community page.

Comparisons we prepared

Hand-written explanations for pairs where the public descriptions and rules support a real distinction: