I What is the purpose of Cosmology and where can I find information about it?

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Cosmology is the scientific study of the universe, focusing on its origins, evolution, and eventual fate. It encompasses various aspects, including the Big Bang, cosmic microwave background radiation, and the large-scale structure of the universe. For reliable information, users are encouraged to utilize resources like Google and Wikipedia. The discussion emphasizes self-directed exploration rather than seeking detailed explanations within the forum. The thread concludes with a reminder to seek out information independently.
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Hello
What is Cosmology what does it do
 
Space news on Phys.org
Did you try using google? It's such a basic question that you'll find tons of good answers.
 
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Hello
I have seen it say deal in study of universe
 
We're not here to hold you by the hand while you explore the world. Use Google, use Wikipedia.

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Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
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Thread 'Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".'

The formal paper is here. The Rutgers University news has published a story about an image being closely examined at their New Brunswick campus. Here is an excerpt: Computer modeling of the gravitational lens by Keeton and Eid showed that the four visible foreground galaxies causing the gravitational bending couldn’t explain the details of the five-image pattern. Only with the addition of a large, invisible mass, in this case, a dark matter halo, could the model match the observations...
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Thread 'Big Bang and Infinite Universe'

Hi, I’m pretty new to cosmology and I’m trying to get my head around the Big Bang and the potential infinite extent of the universe as a whole. There’s lots of misleading info out there but this forum and a few others have helped me and I just wanted to check I have the right idea. The Big Bang was the creation of space and time. At this instant t=0 space was infinite in size but the scale factor was zero. I’m picturing it (hopefully correctly) like an excel spreadsheet with infinite...
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