I've been seeing this effect done by other photographers and thought I would give it a whirl. The way this image was achieved was by zooming out during my 30s exposure. I started at 16mm and as the exposure was almost done I was at 11mm. Because I am zooming out the stars are giving light trails, creating this explosion of the Milky Way. I took two exposures so that I could bring in my foreground without any blur caused by the zoom. By zooming out it has created this dream like world where the Milky Way is blowing up, it is so cool that this can be done in camera without photoshop!