&quot;The Sun by the Atmospheric Imaging Assembly of NASA's Solar Dynamics Observatory - 20100819&quot; by NASA/SDO (AIA) - http://sdo.gsfc.nasa.gov/assets/img/browse/2010/08/19/20100819_003221_4096_0304.jpg. Licensed under Public domain via ウィキメディア・コモンズ - http://commons.wikimedia.org/wiki/File:The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA%27s_Solar_Dynamics_Observatory_-_20100819.jpg#mediaviewer/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:The_Sun_by_the_Atmospheric_Imaging_Assembly_of_NASA%27s_Solar_Dynamics_Observatory_-_20100819.jpg