r/cosmology • u/AutoModerator • 14h ago

Basic cosmology questions weekly thread

7 Upvotes

Ask your cosmology related questions in this thread.

Please read the sidebar and remember to follow reddiquette.

2 comments

r/cosmology • u/abstractanus • 20h ago

Past a certain distance, galaxies stop looking smaller and start looking bigger.

youtube.com

10 Upvotes

0 comments

Subreddit

cosmology

r/cosmology

**/r/cosmology** - a community for questions, discussions, and articles about cosmology.

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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.

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

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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.