Ben Dhyan
Veteran Member
False? I can understand your doubt, for I can't imagine how in a universe that s 13.8 billions years old.....something could be 46 billion light years away.....but please explain why Fraser Cain of Universe Today says this.......This is false. The entire universe emitted the CMBR in every direction. So we suspect to find it everywhere. As explained before, the early universe was extremely dense and hot. The CMBR is the leftover heat. They weren't even microwaves at the time. They were gamma rays.
I think the word "background" in CMBR might be confusing you. The CMBR isn't just in the background. It's everywhere. You're touching it right now, as am I.
Remember, the CMBR is light. You can't see light until it hits your eyes. So if we're able to see any CMBR right now from every direction, it can only mean it's everywhere. Galaxies don't exist between us and the CMBR. Rather, galaxies exist between us and the CMBR's origin point. If you see light from a galaxy, that light is hitting your eyes. So the light it self at that moment isn't billions of light years away, but that's how far it traveled. If you see CMBR, that means CMBR is hitting your eyes. It's not 13+ billions of light years away, but that's how far it traveled before hitting your eyes.
When you see CMBR, you're seeing where it WAS, not where it is. Where it IS is in your eyes, which is why you see it.
The Cosmic Microwave Background Radiation, the very edge of the observable Universe is about 13.8 billion light-years away. This light left the Universe when it was only a few hundred thousand years old, and only now has finally reached us. What’s even stranger, the place that emitted that radiation is now 46 billion light-years away from us.... http://www.universetoday.com/119226/how-far-back-are-we-looking-in-time/
Yes, I understand that CMBR is now omnipresent for the original 'light' has had time to reach us...and everywhere.....and in the process has been red shifted to microwave frequencies... Those early galaxies that followed must be all over the sky.....not in any one direction.... For when we look at the sky...we are looking back in time in every direction so we should see these extremely red shifted galaxies everywhere...and the nearer less red shifted would not....as we then get to the relatively near and they take up specific relative positions... I didn't explain that well but I hope you understand the idea....