We actually program the satellite to look at stars which are behind the field of view and behind the Earth, so to speak. So we’re looking at stars that aren’t actually visible from where the satellite’s position is, and the Earth gets in the way, and that’s how we capture the image.
The "Denver and the Colorado Rockies" link is to the zoomable full-screen version.
Hmmm - tempted to screengrab the sections, stitch them, and make a big print.