Cosmic Microwave Background Radiation (CMBR) Widely Claimed as Evidence for the Big Bang
If there is background radiation coming our way, how would we recognize it?
It would have to originate from far behind the galaxies and nebulae that surround the Earth and would at best be mixed up with radiation from those things. The most obvious clue would be that foreground objects would be backlit, casting shadows on the sky.
There are no shadows.
Source: www dot thunderbolts dot info
Common Misconceptions #10, S. Schirott, Nov. 29, 2013
I am also not a serious physicist but general information on cosmic microwave background radiation is not hard to find.
Actually there are shadows and they are being used to study the universe's structure.
Here's some info on CMB:
From the link:
The existence of the CMB was first theorized by Ukrainian-American physicist George Gamow, along with his students, Ralph Alpher and Robert Herman, in 1948. This theory was based on their studies of the consequences of nucleosynthesis of light elements (hydrogen, helium and lithium) during the very early Universe. Essentially, they realized that in order to synthesize the nuclei of these elements, the early Universe needed to be extremely hot.
They further theorized that the leftover radiation from this extremely hot period would permeate the Universe and would be detectable. Due to the expansion of the Universe, they estimated that this background radiation would have a low temperature of 5 K ( -268 °C; -450 °F ) – just five degrees above absolute zero – which corresponds to microwave wavelengths. It wasn’t until 1964 that the first evidence for the CMB was detected.
Due to the expansion of space, the wavelengths of the photons grew ( became ‘redshifted’ ) to roughly 1 millimetre and their effective temperature decreased to just above absolute zero – 2.7 Kelvin ( -270 °C; -454 °F ). These photons fill the Universe today and appear as a background glow that can be detected in the far-infrared and radio wavelengths
Shadows, Hmm! I fear that my ability to explain is too poor to help you understand. Moreover, I have little knowledge about you; you attended grad school, and like music and science.
There are shadows from the CMBR, which our eyes cannot see because we cannot see microwaves. However, a radio can detect them, for example a radio telescope.
The disk of our Sun blocks the CMBR, and a radio telescope cannot see that part of the CMBR sky. However, as the Earth progresses in its orbit, that part of the sky previously hidden by the sun is exposed. Thus, a radio telescope can see the entire sky.
Shadows of distant stars and galaxies also occur, but stars and galaxies are so distant they are smaller than a pixel on any camera, except those behind astronomical telescopes. Thus, a picture of the CMBR appears shadow free.
Finally, stars, planets, dust and gas in a galaxy are so sparse that they are transparent to the CMBR.
Suppose you see a distant car on a long straight stretch of otherwise empty road. The two headlights appear as one. In fact the car is stopped,and the driver is standing in front of the car. You cannot see either the driver or his shadow. Distant planets cannot be seen, and neither can their shadows.
I hope this helps.