Okay there are parts of truths in all the answers so lets do an explaination

Under strict General Relativity there is no zero reference frame and there is no absolute space

>>>>> All observers who are moving by constant velocities relatively to each other may use the same laws of physics (the principle of relativity). <<<<<<

So the CMBR can be viewed and interpretted from our reference frame. If you want to check this the CMBR looks the same for earth based radiotelescopes as well as faster moving satelitte radiotelescopes.

So what is our reference frame well it is 2.7K temperature frame of the universe and it is not absolute or a zero reference frame.

There is another reference frame which we hope we may be able to use later this year which is 1.95K frame from the nuetrino background radiation which will come from the planck satelite.

http://en.wikipedia.org/wiki/Cosmic_neutrino_background
http://en.wikipedia.org/wiki/Planck_(spacecraft)


SO THE IMPORTANT LESSON ALL OBSERVATIONS HAVE A RELATIVE REFERENCE FRAME AND THEY ARE NEVER PRIVILIGED OR THE ZERO FRAME.

Even the CMBR observations or other cosmological observations of the universe are not exempt from this law.

So answering your actual original question the CMBR reference frame is an event horizon 380,000 years after the Big Bang taking whatever shape the universe was then and the radiation is travelling in every direction trying to reach the edge of the universe which it never can because of the particle horizon




Last edited by Orac; 02/12/13 02:39 AM.
I believe in "Evil, Bad, Ungodly fantasy science and maths", so I am undoubtedly wrong to you.