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r/astrophysics

167.4K members. The best post we have captured here reached 2.5K upvotes, which works out to 15 per 1,000 members.

15peak upvotes per 1,000 members
167.4Kmembers
2.5Kbest post
840most comments
197posts we track

Open r/astrophysics on Reddit β†—

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.

37% 19% 16% 16% 10%
Question 37% Text 19% Video 16% Image 16% Link 10% Gallery 3%

The topics it labels

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

>10^78 years 1

What the ceiling looks like

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

What to do if i have theories?

↑ 2.5K πŸ’¬ 53 question 2019

I am so sick of seeing Neil degrasse Tyson

↑ 2K πŸ’¬ 840 text 2025

BREAKING: NASA telescope photographs unidentified object transiting the Sun this morning.

↑ 1.7K πŸ’¬ 37 gallery 2025

Just paying respects on my end-of-semester vacation.

↑ 1.3K πŸ’¬ 58 image 2024

The Sun just popped off an X2.5-class solar flare!

↑ 1.2K πŸ’¬ 67 video 2026

After nearly 100 years, scientists may have detected dark matter (awaiting reproducibility now) by University of Tokyo

↑ 1K πŸ’¬ 118 link 2025

Beautiful solar flare from earlier today

↑ 936 πŸ’¬ 25 video 2026

Did someone say blackholes..??😍😍😍

↑ 801 πŸ’¬ 18 image 2020

Is Neil deGrasse Tyson an a*hole?

↑ 754 πŸ’¬ 568 question 2024

I built a relativistic simulation of two neutron stars smashing into each other!

↑ 721 πŸ’¬ 42 video 2023

Communities its size

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

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.

Start free β†’

Every figure here is what ViralHunt has captured from r/astrophysics, 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 We deliberately do not publish an average score: our sample is weighted toward a community's best posts, so an average would be flattering and wrong.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.