This video of the Sun is really beautiful. If you don't watch the whole thing (4 mins) be sure to watch the first minute and a half because it shows the activity developing & they show the size of it compared to Earth. It's a lot bigger than we are! The Sun 2012-07-09 by the Solar Dynamics Observatory
This video is made of images taken by the orbiting SDO on July 9 last year. One second in the video is about 6 minutes. It includes all the exciting stuff the Sun does: solar flare, a coronal mass ejection (CME), and structures that loop into the Sun's corona as the magnetic field lines change.