Re-occuring and repeating patterns in nature. Fractal geometry.
There's even a spiritual/religious element to it in "the wheel of life"
I get the whole red-shift thing, even the need for "dark matter" to fill in the gaps.
Yet I can't help feel that we are back to the point at which we thought the earth was flat because of the limitation of our field of view.
Back then it was thought that you just fell off the end of the world, that made sense.
Just like dark matter and all the other fillers in our current theory.