You should be able to get what you want by using a larger image and simply moving it as needed.Pan across Space
Place the image so on the first frame you can only see part of it, then on you last frame move the image so you are now looking at a different part. tweening will sort out all frames inbetween. You should then get the impression that the stars are moving past. The further apart the background is for the first and last frame will decide how fast the pan of the stars will be.
The images below shows what I mean, the green outline shows what you can see in frame at the time of the first and last frames.
Just start the image and end it in the direction you wish the stars to travel.Zoom in/out of Space
If you want the travel into space to see it going past try resizing the image so you can see the whole thing on the first frame, on the last frame have it so you can just see the center of the image. You should get the impression that you are flying into the space. If you start small and go larger you should have the impression you are moving towards the screen.
I found an image on google which i made bigger which may help,
right click on the thumbnail and save as.
Hope that helps with your shot