@sveenoj
I could only be parts of your post because it was hidden by the articles (ps 3 browser) I will answer more thoroughly after reading your whole post.
Light is just a wave (not always) like sound. You know that a cop car with sirenes coming towards you sounds higher after it passes lower. Its because the wavelenghts change because they move look up pictures to get a better impression. The same goes for light if it moves towards you its more blue away from you more red. Andromeda is one of the handful more blue galaxys the rest is increasingly red the further they seem away some galaxys move away faster from us then lightspeed if you ask how can that be dont expect an answer today. The Universe is expanding we can see that on the background radiation which was once light and turned so red that its radio today. And acceleration increases with time we can see it on the light from other galaxys.
Dark Energy is just a theory a good one which is mainstream and makes more sense then the other ones right now. But nothing is set in stone yet.
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