As I've said previously as home secretary, dealing with immigration isn't just a single issue and a single measure and a single step that you take. You've got to keep working at that over time.
The near side of a galaxy is tens of thousands of light-years closer to us than the far side; thus we see the front as it was tens of thousands of years before the back. But typical events in galactic dynamics occupy tens of millions of years, so the error in thinking of an image of a galaxy as frozen in one moment of time is small.