NASA | SDO: Year 4 Sat 2014-05-10T13:48 www.youtube-nocookie.com/embed/NAg4qXsk99c Links http://svs.gsfc.nasa.gov/vis/a010000/a011400/a011460/index.html http://svs.gsfc.nasa.gov/vis/a010000/a011400/a011460/SDO_Year_4_Visuals_List.html