I'm lagging behind everyone else in this BR, but I am looking forward to the next part.
I thought the galactic expansion / contraction stuff was interesting for about a minute, then it bored me for about 20 pages.
And I am not sure the book properly explains how matter is created in a vacuum - overall, I seem to spend an awful lot of time on the internet reading articles on physics.
So, what I am saying is: While I am the first one to hold up my hand and say that my understanding of physics is "basic", I am not sure the book is all that great at explaining things.
So far, the Wizard parts win over the science parts.