What makes astrophysics so interesting is that it gets to the beginning of things. Why did life start on earth, how did the universe begin, how large is it, and so forth. The problem with many documentaries on astronomy is that the narrator "tells" us the theories without "explaining" the scientific thoughts or experiments behind the ideas. This documentary does two things very well - it gives us the science behind the ideas and it produces some of the most amazing computer graphics or photo images of what the Milky Way or other galaxies look like.
There is a lot of material covered here - why the Milky Way is understood to be one of the oldest galaxies, what controls the center of the galaxy (Answer a black hole), the theory of dark matter, the importance of supernovas, the difference between spiral and elliptical galaxies.
My favorite part of the DVD was an analysis of what the universe would look like if the astronomer mapped out its dark matter with a computer model. Then a picture of the universe was produced which matched it perfectly. WOW!
There is a great deal of information in this DVD, but more importantly, a great deal of scientific explanation that supports the information. To me, it is astonishing that in 400 years we have moved from Newton to a rather comprehensive theory of how the universe was formed. This is something teenagers and adults can enjoy together. National Georgraphic did an outstanding job on the illustrations - computer or otherwise - how our galaxy works.