Tiny little white dots, all over. These are Hot Pixels.
Hot pixels are part of the CCD reality.
These pixels are on a very small space. In consumer cameras this would be from 8 mm to half an inch. These pixels are never the same and each of them has different charge leakage rate. If you expose the CCD long enough, the pixels thanks to this leakage will simply lighten up even with no light. Because of different quality and sensitivity of each pixel, they will start appearing as a noise - but if you would able to expose for much longer, finally all pixels will lighten up.