A satellite in low earth orbit (LEO) circles the globe roughly every ninety minutes. Since you'll only get a good night shot with the earth between the satellite and the sun, then as long as the shots were taken fairly close together (and not months apart) you'll always be facing the same stars regardless of the rotation of the earth below. You would only have star movement with a geosynchronous satellite that remains in a fixed position above the earth and rotates with it (but then you wouldn't have shots of different sides of the planet).
I think the full night shots are real, but possibly enhanced for more contrast and definition.
Sorry Hydramatic....
I WIN! 
