The most detailed picture of a sunspot

The photo shows a sun spot at about 3600ºC, surrounded by a mosaic at 5800ºC. The image was taken on July 2 with the Big Bear Solar Observatory team; a 5.25-feet telescope that is able to resolve sun details as small as 45 kilometers in optimal conditions. The image itself shows details measuring 0.09 arcseconds, which is about 65 kilometers.

Source: Gizmodo