The Universe: Alien Galaxies is a 44 minute video I found on both Youtube and the History Channel website. The top of the page includes the URLs that were correct at the time this was posted.
The video covers galaxy formation and has great images of the universe (some computer animation, some actual photos).
I used this video and questions with lower level 9th grade students. Some questions are short answers like a number or a name. Other questions ask for a description or explanation.