Hubble redshift of Big Bang noise?

[bwanaaa]

Since the emissions of far away stars are redshifted proportionally to their distance, the same must be true of all em emissions. Since the cosmic microwave background is everywhere, then the background em radiation from far away should be Doppler shifted as well. We should there fore see cosmic em background smeared across the whole em spectrum. But it is in a narrow band only so obviously I am missing something. Can someone illuminate me?

 

[DigDog]

ask StarTalk.

 

[Revolution 11]

The actual physics are a lot more complicated than my summary but this is what basically happened.

There were no photons during the Big Bang. Particles such as photons happened after the universe had already started expanding and cooling. Around age 1 second, neutrons and protons had formed. This process is still not observable even with the strongest telescopes because the universe was opaque. Light was continuously absorbed and re-emitted by countless sub-atomic particles. Technically this is called Thomson scattering where photons only travel a small mean distance before encountering a free electron.

After about 380,000 years, the first atoms were stable enough to form. "Space" became optically clear as protons and electrons combined into neutral hydrogen atoms and light could move. This first light is actually the cosmic microwave background radiation and we can and do see it with our instruments. There are some very detailed maps of the radiation created over the years.


For a better layman's explanation, look up "recombination (cosmology)" on Wikipedia.

 

[bwanaaa]

So when Penzias pointed his horn into space and kept hearing the same hiss, it was the"Cosmic background radiation; primal glow The background of radiation mostly in the frequency range 3 × 10^8 to 3 × 10^11 Hz … discovered in space in 1965. It is believed to be the cosmologically redshifted radiation released by the Big Bang itself."

But my question hints at asking the geographical direction and origin of the CMB. I am questioning why the frequency-intensity distribution looks like this:
http://en.wikipedia.org/wiki/Cosmic_microwave_background#mediaviewer/File:Cmbr.svg

Why does the intensity drop off at the lower frequencies?

In simple terms, The further out you look, the more red-shifted is the light from the big bang. And since the surface of a sphere increases as r^2, there should be more photons reaching your eye the further away you look. so intensity should increase with lower frequencies?

 

[Z15CAM]

Gravitational Lensing throw Hubble is a peek into our quest to understand the beginning and the end of the Universe where Dark Matter and Dark Energy is the glue that defines what the Universe is and we can't see it.

And the Big Question is: Why do we exist other then to observe, if not for Faith and GOD and understand Dark Energy and the ultimate fate of the Universe and Our Consciousness.