I was looking for an image for my new work hotdesk PC, and decided to put the Red Square Nebula on it. I've already had one person stop and comment.
Then I got to thinking of colours in the Universe. Then I thought of a favourite movie - "Three Colors Red", which led me to think of the Three Colors trilogy of movies and to wonder if I could match astronomical photos to them - just on colour.
I've run out of movies - there were only three in the trilogy (by definition )! Feel free to add your own colour pairs. OK, what is green or purple in the heavens?