Is Cosmology the Same as Cosmic Rays?

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Cosmic rays and cosmology are fundamentally different concepts. Cosmic rays refer to high-energy particles originating from various cosmic events, while cosmology encompasses the study of the universe's structure, origin, and evolution. Cosmology addresses questions about the universe's size, composition, and history. The distinction highlights that cosmology is a broader scientific field, whereas cosmic rays are a specific phenomenon within astrophysics. Understanding these differences is crucial for grasping the scope of each discipline.
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Is there a difference between Cosmology and Cosmic rays ?
 
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Well I can think of one; the first is a single word of 9 letters..

Can you not make an effort to define your question more? Perhaps you suggest Cosmology is JUST the study of cosmic rays?
 
The two are completely different.

Cosmic rays are high energy particles of cosmic origin (produced in the sun, supernovae, gamma ray bursts, etc.). It is just a catchall term for any high-energy radiation coming from outer space.

Cosmology, on the other hand, is the study of the universe as a whole, including its birth, evolution, and final fate. So cosmology as a science asks questions like "How big is the universe?", "What is the universe made of?", or "What was the universe like when it was very small?".
 

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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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