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1. air is blue
3) Radio telescopes can see the color of the space, that is CMB.
5) Photons from distant galaxies are scattered by cosmic powder of different materials and sizes, lowering its wavelength
7) It is not necessary to assume the expansion of the universe to explain either the CMR or redshift of galaxies.
Do you know any article or book comparing and explaining how to disentangle dust scattering from doppler effect?
While visually blue, our daily sky has a range of wavelength similar to blackbody radiation curve.
It is not so perfect as CMB, but the later has all types of dust materials to be scattered during billions of years and that can smooth the curve.
Suppose we humans had eyes which didn't give colour-vision. So that we couldn't distinguish any colours. Or even recognise the idea of "colour". So that our brains perceived no sharp intrinsic difference between "red" and "blue". But only provided a smooth gradation of grayness in the Universe.How would that affect our view of the Universe? Would we be so intensely concerned about the "red-shift" in the spectra of distant galaxies?
Suppose we humans had eyes which didn't give colour-vision. ...How would that affect our view of the Universe?
a small dust powder in the space formed by trillions of atoms, at some temperature, will emit a near blackbody radiation typical to its temperature,
If the average temperature of the space dust is about 2.7K
the probability of photoelectric interaction to solid dust particles in the space would increase
to compare with the doppler effect calculation
get the spectra of a galaxy now and again six months later
I have no doubt over the reality of doppler effect, and its use to estimate the relative speed of stars to us.I only say that without another way to measure galaxies speeds, any conclusion based on redshift shoud be viewed "with a grain of salt"
In old disk players, if we had for any reason a slower revolution speed, all the tunes or voices would be played at lower frequencies
Can redshift be measured via cosmic ray emissions from galaxies?
Quote from: KryptidCan redshift be measured via cosmic ray emissions from galaxies?At one time it was thought that cosmic rays were electromagnetic in nature, with higher energy than gamma rays.We now know that cosmic rays are atomic nuclei (mostly protons), accelerated to relativistic velocities by high-energy events in the galaxy (or, presumably, other galaxies).As a massive object, an atomic nucleus cannot be accelerated to reach the speed of light, and so it does not display a redshift in the same way that electromagnetic radiation does.In addition, as a charged particle, its direction is deflected by the Earth's magnetic field, and magnetic fields in our galaxy; if it came from another galaxy, it would be affected by magnetic fields in the source galaxy, and any magnetic field in intergalactic space. The Sun's solar wind (and solar cycle) are known to affect the intensity of cosmic rays arriving at Earth. Cosmic rays are thought to originate from the Sun, from the crab nebula (a pulsar which is a supernova remnant), from the direction of the galactic core, and supernovas. But it is really hard to pin down cosmic rays which come from a particular galaxy, to compare it with the redshift of that galaxy. Even if we could pin down a particular cosmic ray as coming from a particular galaxy, cosmic rays are rare, and it would be incredibly rare to detect two from the same galaxy. And we can't measure cosmic ray energy very accurately, as we mostly detect them after they have collided with multiple atoms in the upper atmosphere.So I'm afraid that any comparison between galactic redshift spectra and cosmic ray energies is beyond our current technology.https://en.wikipedia.org/wiki/Cosmic_ray#Sources_of_cosmic_rays
1) While we used to say that sky is blue, and Gagarin said that the earth is blue, it seems more correct to say: air is blue.2) When we see a mountain not too far the green of vegetation or the ochre of the soil are evident. Far away mountains are bluish. 3) Radio telescopes can see the color of the space, that is CMB.4) Distant galaxies are reddish.5) Photons from distant galaxies are scattered by cosmic powder of different materials and sizes, lowering its wavelength 6) That scattering, considering the reflexion in all directions, also results in the CMB color.7) It is not necessary to assume the expansion of the universe to explain either the CMR or redshift of galaxies. By Occam's razor the expansion of the universe is not necessary, while it is a possible explanation, as the hypothesis of creation by God.