Professor Mike Merrifield discusses Bode's Galaxy, known as M81 or NGC 3031. More links and info in full description ↓↓↓ More Messier Object videos: http://bit.ly/MessierObjects More with Professor Merrifield: http://bit.ly/Merrifield_Playlist Testing Density Wave Theory with Resolved Stellar Populations around Spiral Arms in M81 https://arxiv.org/abs/1507.07000 Deep Sky Videos website: http://www.deepskyvideos.com/ Twitter: https://twitter.com/DeepSkyVideos Facebook: http://www.facebook.com/DeepSkyVideos More about the astronomers in our videos: http://www.deepskyvideos.com/pages/contributors.html Supported by the University of Nottingham Back us on Patreon: https://www.patreon.com/deepskyvideos Video by Brady Haran and James Hennessy