At some level one expects to see irregularities, or anisotropies, in the temperature of the radiation. The best present-day data comes from three sources Ground-based measurements with radiometers operating at a single wavelength. at < 3 mm, direct … The temperature of the Cosmic Microwave Background (CMB) is very nearly isotropic. So why is the CMB temperature so nearly uniform? The astronomical community would have to wait another 2 years to see if the maps made by COBE's other instruments contained the seeds that … The structure we see today must have come from seeds in the early Universe. (1) Horizon problem: Why is the universe so smooth on large scales? The smooth spectrum contained no hints of those seeds. 1. That is utter nonsense. While the CMB is predicted to be very smooth, the lack of features cannot be perfect. In short, the CMB doesn't favor a bang theory, rather it simply demonstrates that if you filter the hell out of any background image you can get a pretty smooth image. But with almost every discovery, the CMB raised new and more vexing questions. Inflation Theory explains this by stating that shortly after the Big Bang, the universe expanded tremendously in a very short amount of time. There is more DM than baryons, so the dark matter in the overdense regions collapses, forming dense regions. This expansion grew the size of the universe from submicroscopic to the size of a golf ball in 10 -35 seconds. 2.4 The CMB and the history of the Universe 2.4.1 The spectrum of the CMB Since its discovery, the spectrum of the CMB has been measured at a wide range of wavelengths. That is, when you look at different patches of the CMB, their temperatures are the same to within 1 part in 10,000. But the CMB is a reflection of that early Universe, so those seeds must be present in the CMB or we would not see structure today. There are little density enhancements against this smooth background.
The CMB is absolutely *not* the smoking gun that proves the big bang theory. So what? At some level one expects to see irregularities, or anisotropies, in the temperature of the radiation. The Big Bang creationism myth had no means to produce a blackbody spectrum at any temperature, let alone 2.725K, and so the CMB is nonsense. The baryons follow along for the ride. Here are six of the biggest lingering mysteries sparked by studies of the big bang. Why lensing is important • 2arcmin deflections: ∼ 3000 - On small scales CMB is very smooth so lensing dominates the linear signal at high • Deflection angles coherent over 300/(14000/2) ~ 2° - comparable to CMB scales - expect 2arcmin/60arcmin ~ 3% effect on main CMB acoustic peaks • Non-linear: observed CMB is non-Gaussian
Observations of interstellar CN, in the tradition of McKellar. The Universe, thanks to inflation, starts off very, but not perfectly smooth.