The latest news about astronomy, space, and the NASA/ESA Hubble Space Telescope presented in High Definition.
http://www.spacetelescope.org/videos/hubblecast/
Hubblecast 66: Hubble uncovers the secrets of the Ring Nebula
Episode 66 of the Hubblecast explores the Ring Nebula (Messier 57). Although this nebula is one of the most famous objects in our skies, more than 200 years after its discovery astronomers are still unveiling some of its secrets.