In recent years there have been significant improvements in affordable amateur astrophotography technologies. This, combined with the advent of remote robotic telescope hosting at dark sites, has resulted in a step increase in the capabilities of amateurs to conduct scientific exploration of the cosmos. Amateur astronomers have been discovering literally hundreds of previously unknown cosmic objects. The majority of these are planetary nebulae, but supernova remnants, and other more mysterious objects are also being found. Peter will explain how such discoveries are made and illustrate the discovery process by way of a real-life case study. Deep amateur imaging is also revealing previously unknown features of well-known objects - and some examples of these will also be featured.