One of the most complex machines ever made, the Hubble telescope, was a space dream that took 20 years to complete. Having made 1.3 million observations and enabled 15 thousand plus scientific papers to be written, this wonder of a device has had a dramatic history. In this anniversary film, find out how a triumphant launch soon turned disastrous, meet the people who use it every day and also those who maintain it, and much more.