DKIST Sunspot Beach TowelSoak up some rays with a beach towel featuring a real image of the Sun, from the National Science Foundation's Daniel K. Inouye Solar Telescope (DKIST, pronounced dee kisst"), the most powerful solar telescope in the world. The dark splotches are a cool sunspot that is about 10,000 miles across, larger than the Earth! And cool is definitely relative sunspots are about 6,000 F, compared to 10,000 F for the Sun's surface on average. Towel is 52% cotton,