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r/AstronomyNSFW

The amateur hobby of humanity since the dawn of time and scientific study of celestial objects. Founded 2008 · 3.1M members

3.2M members. The best post we have captured here reached 70.8K upvotes, which works out to 22 per 1,000 members.

22peak upvotes per 1,000 members
3.2Mmembers
70.8Kbest post
8.1Kmost comments
506posts we track

Open r/Astronomy on Reddit ↗

What actually lands here

The mix of post types among everything we have captured. Posting a link where almost nothing but images lands is wasted effort, and this is the fastest way to see it.

56% 12% 10% 9%
Image 56% Gallery 12% Link 10% Text 9% Video 7% Question 6%

The topics it labels

Flairs are the community's own categories, and the closest thing a subreddit has to telling you what it wants.

Astrophotography (OC) 206 Other: [Topic] 29 Astro Research 25 Discussion: [Topic] 22 Question (Describe all previous attempts to learn / understand) 21 Astro Art (OC) 19 Other: Article 3 Object ID (Consult rules before posting) 2 Other: Processing 2 Discussion: [non-telescope gear] 1

What the ceiling looks like

The biggest posts we have captured here. Links go to the original on Reddit.

Finally printed my eclipse drawing. It took 90ish hours to make, so stoked how it turned out

↑ 70.8K 💬 1K image 2020

My sweet wife made me a Saturn cake for my 29th birthday, since 1 Saturn year is about 29 Earth years.

↑ 61.3K 💬 751 gallery 2025

I’m trying to get LEGO to produce this model of NASA’s JWST to help teach people about space telescopes. I still need 3.8k votes on LEGO Ideas to get…

↑ 56.3K 💬 914 video 2021

this seems really cool, how accurate is she?

↑ 41.6K 💬 404 image 2025

I made a tool to compare Webb's new images to Hubble!

↑ 39.6K 💬 473 image 2022

Astronomer here! Today is my first day as a professor!

↑ 38.8K 💬 792 image 2024

Today is my first day as a postdoctoral researcher at the Harvard-Smithsonian Center for Astrophysics! :D

↑ 30.9K 💬 645 image 2019

That would be a sight

↑ 26.1K 💬 487 image 2025

My view of the Milky Way from the ISS Cupola window.

↑ 25.2K 💬 405 image 2026

I photographed the Milky Way arch in Brazil

↑ 22.3K 💬 427 image 2026

Communities its size

Within four times the member count either way, so the comparison is fair. Sorted by upside.

r/Astronomy, in numbers

Answered from the posts ViralHunt holds from this community, not from Reddit's own about page.

What is r/Astronomy?
r/Astronomy describes itself this way: The amateur hobby of humanity since the dawn of time and scientific study of celestial objects. It was founded in 2008 and has 3.1M members.
How many members does r/Astronomy have?
r/Astronomy has about 3.2M members. ViralHunt has tracked 506 of its posts; the biggest reached 70.8K upvotes, which is 22 per 1,000 members.
What is the most viral post on r/Astronomy?
"Finally printed my eclipse drawing. It took 90ish hours to make, so stoked how it turned out" reached 70.8K upvotes and 1K comments in 2020, the highest score among the posts we hold from r/Astronomy.
What subreddits are similar to r/Astronomy?
Communities of a comparable size we track: r/PcBuild, r/ukraine, r/LosAngeles, r/LeopardsAteMyFace, r/okbuddycinephile, r/blackcats.
What kind of posts do best on r/Astronomy?
Of the posts we hold, 56% are image posts and 12% are gallery posts.
When is the best time to post on r/Astronomy?
Across 506 timestamped posts we hold, the slots whose posts averaged the highest score are Saturday at 14:00 UTC (18K avg upvotes), Monday at 20:00 UTC (17.3K avg upvotes), Tuesday at 15:00 UTC (13.2K avg upvotes). The busiest day is Wednesday. For Reddit as a whole, see the best time to post on Reddit page.
How many upvotes does a post need to reach the top of r/Astronomy?
The 20th-best post we hold from r/Astronomy has 16.8K upvotes, so that is roughly the bar for the top twenty. We captured 51 posts from it in the last 30 days.

See what is climbing here before you write

ViralHunt tracks Reddit and eight other networks, records how every post grows, and puts what is taking off in front of your team in one list.

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Every figure here is what ViralHunt has captured from r/Astronomy, not everything the community has ever posted. We deliberately do not publish an average score: our sample is weighted toward a community's best posts, so an average would be flattering and wrong. Peak per 1,000 members is computed the same way for every community listed. See how we measure.