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r/cosmology

141K members. The best post we have captured here reached 701 upvotes, which works out to 5 per 1,000 members.

5peak upvotes per 1,000 members
141Kmembers
701best post
505most comments
194posts we track

Open r/cosmology 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.

25% 23% 20% 17% 12%
Link 25% Question 23% Text 20% Image 17% Video 12% 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.

Question 2 Misleading Title 1 New Result! 1

What the ceiling looks like

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

Constant 1g acceleration would get you to mars in 2 days and i had to stop and reread this several times

↑ 701 πŸ’¬ 505 text 2026

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

↑ 646 πŸ’¬ 34 link 2025

Why is there such a large cold area in the CMB?

↑ 591 πŸ’¬ 147 image 2025

Fascinating

↑ 590 πŸ’¬ 54 image 2025

3D map of an actual local universe you can fly through, made using real data from cosmic survey 2MRS

↑ 547 πŸ’¬ 37 video 2026

Is this accurate? I saw this tweet a few years ago and I think about it often.

↑ 542 πŸ’¬ 77 image 2023

Can someone just summarize this and explain to me like im five

↑ 505 πŸ’¬ 55 video 2021

Thought you all might find this interesting.

↑ 491 πŸ’¬ 15 video 2020

100% Dark Matter Simulation

↑ 488 πŸ’¬ 112 video 2025

JWST reveals galaxies 33 billion light years away

↑ 484 πŸ’¬ 59 link 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/cosmology, 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 We deliberately do not publish an average score: our sample is weighted toward a community's best posts, so an average would be flattering and wrong.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.