Thursday, November 21, 2013 8:01:33 AM
@turdburglar: you can choose to believe whatever you want, I am a physicist who happens to like Adventure Time and laughed a lot at that episode. What just because I work in science I have to always be serious?
Wednesday, November 20, 2013 11:55:12 PM
The cosmological principle states that the Universe is essentially the same in any particular region of SPACE. It does NOT, however, state that the Universe is the same at every era of TIME since its origin. Due to the finite speed of light, these quasars are seen by us as they were when the Universe was less than half its current age. If we could see what our own local cluster looked like 8 billion years ago, it would probably look quite similar to a small region of this structure. The black holes at the center of our galaxy and the Andromeda galaxy would be gobbling up matter and spewing out gamma and X-rays so that an observer 8 billion LY away would see them as quasars.
The finite speed of light makes the cosmological principal pretty much impossible to prove, because the farther out we look in space, the farther back we look in time. We are comparing our region of the Universe as it is now to distant regions that are much younger.