I love false-colour images.  They reveal detail that you can’t see in real life, but they also highlight things in an artistic way.  For me it’s an excellent marriage of art and science, and as a communicator it helps me get concepts across in an accessible way.  So when I saw the APOD image of Saturn from earlier this week, I had to discuss it. Saturn never has looked this way, and it never will.  The colours are vivid and unrealistic, but they show the differences in three distinct but close wavelengths of light on the electromagnetic spectrum.  All of...