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If space itself is expanding, then the space between particles should also be expanding and I see no evidence for this.
My own take on this is that the notion that space and time are variables is the greatest tragedy that has ever happened to physical science.
How do you explain the results of the experiments that have proven that the rate of time varies due to both gravitation and movement?
I too suspect that space is not expanding and can not expand.
A while back, I was reading an article that theorized expanding space was responsible for the gravitational effect. The conclusion was drawn that because space itself is expanding, the cumulative effect for every particle within the earth growing, resulted in an acceleration of it's surface away from the center. Quite ridiculous when you think about it but this is where we end up when we propose absurd theories when the more logical and simple explanations are forsaken.
In astronomical spectroscopy, the Lyman alpha forest is the sum of absorption lines arising from the Lyman alpha transition of the neutral hydrogen in the spectra of distant galaxies and quasars.These absorption lines result from intergalactic gas through which the galaxy or quasar's light has travelled. Since the absorption and emission of light follow the laws of quantum mechanics, only photons with specific energies can be absorbed. This causes each individual absorption line. The forest is created by the fact that photons that come to us from distant light sources show Hubble redshift that depends on the distance between us and the source of light.