The concept of an infinite universe where every point is the center is difficult to describe. One way to convey the "flavor" of such a concept is to use an analog - that is a simplified but imperfect similar concept. One such "analog" is the two dimensional surface of a sphere and how no spot on the sphere is the center of that surface. Try and grasp that concept then try to extend it to three dimensional space. Of course there are differences, that is why we call the example an "analog".
Yes, we can actually see our universe at any selected time in the last 14 billion years. Pick any time, and look for a galaxy with the appropriate red shift. We have no reason to believe the speed of light has changed over the years. The need for dark matter is based on the velocity distribution in galaxies, has nothing to do with the speed of light. Dark energy is needed to explain acceleration of far away galaxies, also not related to speed of light.
We can't be falling into a black hole as the recessional velocity of galaxies would be approaching the speed of light only on one side of us.
The introduction of extra dimensions is not needed to explain the fact that far away galaxies are receding from us at the speed of light. The simplest explanation is that there was a Big Bang.
Yes, we can actually see our universe at any selected time in the last 14 billion years. Pick any time, and look for a galaxy with the appropriate red shift. We have no reason to believe the speed of light has changed over the years. The need for dark matter is based on the velocity distribution in galaxies, has nothing to do with the speed of light. Dark energy is needed to explain acceleration of far away galaxies, also not related to speed of light.
We can't be falling into a black hole as the recessional velocity of galaxies would be approaching the speed of light only on one side of us.
The introduction of extra dimensions is not needed to explain the fact that far away galaxies are receding from us at the speed of light. The simplest explanation is that there was a Big Bang.