Question:
Why does the universe appear relatively uniform in all directions?
For example, why does the background microwave radiation (with
the famous minor fluctuations) appear all over the sky? The same
question applies to the distribution of galaxies. If our telescopes
can see back almost 15 billion years - or over 90% of the lifetime
of the universe, why don't we see more activity toward what was the
center of the universe? If we can look 15 billion light years in
all directions then (a) we are still at the center of the universe
(just like we were at the center of the solar system!) (b) the
universe is 30+ billion years old or (c) I don't get it. Are we
perhaps looking at 'folds' in the universe?
Replies:
The universe is NOT uniform. We are not at the center.
Interstell (intergalactic) dust obscures what we cannot see
directly. The universe may indeed be folded but since
I hate folding my laundry then perhaps the last load
the universe found itself in has yet to be folded.
Just a thought
NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.