This collection of beautiful images of space taken by photographers from all over the world comprises images from the first four years of the Astronomy Photographer of the Year competition, which is organized by the Royal Observatory, Greenwich, in association with Sky at Night Magazine, and powered by the photo-sharing website Flickr. From giant storm systems in Jupiter's atmosphere to the colourful wispy remnants of a supernova explosion and the dazzling green curtain of the Northern Lights, the competition brings together some of the last four years' best space imagery of astronomical objects from within our solar system and far into deep space by astrophotographers from around the world.