You may take some hilarious photos at work. Perhaps snaps of some amusing post-its, or someone larking about with a novelty hat – and there’s nothing wrong with any of that. If anything, keep it up. But please don’t be dismayed when you see that Don Pettit has been casually snapping what he sees every day out of his office window – the cosmos. In these spectacular long-exposure shots, Don conveys a snapshot not just of what it’s like to be a flight engineer on a spacecraft but the sheer amount of light Earth emits from the cities that cover it, and the huge amount of light that the stars and auroras feed back.