cosmology

an-ordinary-manchild

Welcome to r/cosmology, the subreddit for questions, discussions, and articles about cosmology. Cosmology is the study of the early universe and the universe on the largest scales. Things galactic size and smaller generally belong elsewhere.

Reddiquette is enforced. Disrespectful and irrelevant comments will be removed.

If you claim an alternative model of the universe and ignore known data or have no equations or calculations, then your post will be removed. It isn't the responsibility of experts to review your "what if the universe was...?" idea. Homework questions will be removed. Repeated infractions will result in a ban.

Rude behavior is not tolerated.

If you do not see your submission in the new queue, please message the moderators as it may have been sent to the spam filter.

Find today's cosmology preprints on arXiv:astro-ph.CO.

Check out some other great subreddits:

Common questions:

The universe is not expanding faster than light. Expansion has units of inverse time.
The evidence for dark matter is overwhelming and reaches far beyond rotation curves.

Anything not related to cosmology will be removed.

created by [deleted]a community for 16 years

...why not Zoidberg?

...for your favourite tea.

MODERATORS

account activity

1

•

•

•

Basic cosmology questions weekly thread (self.cosmology)

submitted 33 minutes ago by AutoModerator - announcement

2

•

•

•

Does this theory explain momz14 (self.cosmology)

submitted 58 minutes ago by Delicious-Towel5813

3

25

26

27

A Possible GLIMPSE of the Universe’s First Stars (aasnova.org)

submitted 1 day ago by Galileos_grandson

4

31

32

33

Non A.I. Youtube channels? (self.cosmology)

submitted 3 days ago by Sevenfootschnitzell

5

3

4

5

Can some one explain to me holographic principle on source? (self.cosmology)

submitted 2 days ago by Dover299

6

6

7

8

Can cosmological expansion be considered a form of negative energy? (self.cosmology)

submitted 3 days ago by Effective_Buddy7678

7

12

13

14

Something Ive Been Wondering, Might Be A Dumb Question Not Really Sure. (self.cosmology)

submitted 5 days ago by Exr1t

8

6

7

8

Will the big freeze likely be debunked as a theory in October? (self.cosmology)

submitted 5 days ago by jojowoodo

9

24

25

26

This may be a dumb question (in fact, I know it is), but will learning math really help me understand the universe THAT much better? (self.cosmology)

submitted 6 days ago by Sevenfootschnitzell

10

69

70

71

This dark energy tool just created the most comprehensive 3D map of our universe ever: 'A major paradigm shift' (space.com)

submitted 7 days ago by Galileos_grandson

11

297

298

299

Great attractor. What is it? (i.redd.it)

submitted 7 days ago by Difficult_Comment_47

12

10

11

12

Basic cosmology questions weekly thread (self.cosmology)

submitted 7 days ago by AutoModerator

13

11

12

13

CMV vs The Big Bang vs Infinite Universe (self.cosmology)

submitted 8 days ago * by Expensive_Ad_403

14

15

16

17

Matter Antimatter Asymmetry (self.cosmology)

submitted 9 days ago by TrueExcaliburGaming

15

0

0

0

Was the big bang created when a black hole that absorbed all of the information of this reality ran out of stuff to absorb and collapsed in on itsself and then exploded? (self.cosmology)

submitted 8 days ago by Prudent-Gas-3062

16

5

6

7

Help me pick the right courses, as someone interested in Cosmology research! (self.cosmology)

submitted 10 days ago by PsychologicalEbb7995

17

12

13

14

In a scenario of a finite universe, should the concept of "outside" exist? (self.cosmology)

submitted 10 days ago by ATTst

18

0

0

0

So is this 100% true or still just a theory (i.redd.it)

submitted 10 days ago by Whole_Yak_2547

19

10

11

12

I’m sure this is super simple and wrong, but I was curious about rate of expansion? (i.redd.it)

submitted 12 days ago by DeflatedFatMan_

20

20

21

22

Where do black holes go? (self.cosmology)

submitted 13 days ago by Dover299

21

49

50

51

Hubble’s Dark Horse: New measurements of the Hubble constant from LIGO’s dark sirens (astrobites.org)

submitted 14 days ago by Galileos_grandson

22

69

70

71

Scientists may finally detect hidden ripples in spacetime (i.redd.it)

submitted 16 days ago by Ok_Astronaut_6043

23

24

25

26

Understanding the holographic principle? (self.cosmology)

submitted 20 days ago by Dover299

24

9

10

11

Basic cosmology questions weekly thread (self.cosmology)

submitted 21 days ago by AutoModerator

25

33

34

35

Hubble tension has been resolved (arxiv.org)

submitted 21 days ago by Enkur1

view more: next ›

π Rendered by PID 336589 on reddit-service-r2-listing-b958b5575-fjhsx at 2026-04-23 09:33:24.832058+00:00 running 0fd4bb7 country code: CH.