We take you inside the William Herschel Telescope - once the biggest telescope in Europe and still one of the world's most effective. Extra anecdotes from Mike Merrifield (University of Nottingham) and Vik Dhillon (University of Sheffield). Our thanks to the Isaac Newton Group of Telescopes for hosting as at La Palma... More details about the WHT (and full image credits) at: http://www.ing.iac.es/ Deep Sky Videos website: http://www.deepskyvideos.com/ Twitter: https://twitter.com/#!/DeepSkyVideos Facebook: http://www.facebook.com/DeepSkyVideos Flickr: http://www.flickr.com/photos/68847473@N02/ More about the astronomers in our videos: http://www.deepskyvideos.com/pages/contributors.html Videos by Brady Haran