Cosmic Microwave Background Surveys

[Martyn Arthur]

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.

 

[Martyn Arthur]

Apologies, I intended to post only the link, not realizing it would start the video off!

 

[Ibix]

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.

 

[Martyn Arthur]

That is very clear thank you
martyn