I have several stupid, layman questions concerning outer space. Is there a
web site that answers such questions authoritatively but in layman's terms?
For example:

I read that astronomers can see to the edge of the known universe or when
the universe was only a few hundred million years old. Do the astronomers
look in all directions in relation to the earth? Where is earth in relation
to the rest of the universe? Are we in the middle, for instance?