We have all become used to seeing the stunning images produced by the Hubble Space Telescope in the media. Usually these images are accompanied by amazing-sounding conclusions that astronomers have apparently drawn from them. But how do you get from the images to the conclusions? Why are those particular images so important, and how do they tell us the answers to big astronomical questions? In this talk, I will present a personal selection of some of Hubble's most amazing images and try to explain why they are so important scientifically. The talk will cover a wide range of topics, from the birth and death of stars all the way to cosmology.