NASA’s Solar Dynamics Observatory, a brand new spacecraft launched in February, has began sending back the most amazing and highest quality images of the sun ever taken by humanity.

More amazing images and video
http://science.nasa.gov/science-news/science-at-nasa/2010/21apr_firstlight/

Official site of the spacecraft
http://sdo.gsfc.nasa.gov/

Wikipedia Article
http://en.wikipedia.org/wiki/Solar_Dynamics_Observatory