More Messier Object videos: http://bit.ly/MessierObjects Variable "Delta Scuti" stars are a big part of our chat about Messier 11, an open cluster named after wild ducks. Discussed by Professor Michael Merrifield from the University of Nottingham. The paper being discussed is at: http://bit.ly/1pRgVnU With thanks also to Richard Townsend, ESO and our usual band of astro imagers. Tiny bit of extra footage from this interview: https://www.youtube.com/watch?v=t0pd19WyJHw 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 Video by Brady Haran