  == The Scale of the Universe  Why? ==  Maybe this has been discussed, or maybe someone has a clear idea, but: why is this section here?  As written it describes three methods of distance estimation, none of which is based on parallax.  It also discusses the end goal, estimating the size of the universe, which again has nothing to do with the topic in question.  I don't believe this section belongs.  If no one can give a good justification, I am going to delete it.   