Cropped detail from a full-disk image of the sun during Mercury's transit of May 9, 2016. The irregular shaped sunspot group at upper right helps emphasize the very round dot of our solar system's smallest planet. Or second-smallest, depending on who you ask. :-) (Photo taken using camera-on-tripod with Baader Astrosolar filter, 24x. Panasonic DMC-FZ200, 1/2000sec at f4.5, ISO 100.)