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Thank you all but I have one last (at this time) question. The concept of it being uniform in every part of the sky when measured, is this uniform nature due to photons travelling from the same distance or is it uniformly distributed throughout the observable universe like the spread out between here and jupiter. What I am trying to ask is what we are measuring do the photons come from cool gas that is 380 000Ly less than 13.7 biil Ly away. The image in my head is of a balloon in which the edge is the source of the CMBR and it has travelled for this time to us and due to the expanding nature of space time has stretched by a factor of 1000 and therefore appears in the microwave section of the electromagnetic spectrum. I am a high school physics teacher and want to get this right before I blow my students mind.
thanks
Mark
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