I Cosmic Microwave Background Surveys

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The discussion focuses on the Cosmic Microwave Background (CMB) and its relation to the Milky Way. It questions whether the Milky Way is a 'closed' system and if the surveys are based on data from the visible Universe or limited to the Milky Way. The CMB is identified as a universal phenomenon, originating from the hot plasma of the Big Bang and now located approximately 45 billion light years away. This indicates that the CMB encompasses regions far beyond the Milky Way. The conversation clarifies that the CMB is not confined to the Milky Way, emphasizing its omnipresence in the universe.
Martyn Arthur
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TL;DR
Is the survey Universally representative?
If I understand correctly, by reference say here, the results seem to relate to a survey of the Milky Way.
1. Is the Milky Way a 'closed' system?
2. Whether or not, were the surveys based on data from the visible Universe, or restricted in all or part to the data form 'within' the Milky Way.
 
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Apologies, I intended to post only the link, not realizing it would start the video off!
 
The CMB is everywhere in the universe. The radiation comes from the hot plasma of the Big Bang and has been travelling since then. The stuff that emitted the radiation we now see as the CMB is currently around 45 billion light years away, far beyond the Milky Way.
 
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That is very clear thank you
martyn
 

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