The sun dressed up as a jack-o'-lantern for Halloween. A NASA observatory captured what appeared to be smile on the sun’s surface, showing what are actually splotches that are cooler than the surrounding areas. The dark areas that make up the facial pattern are what are called coronal holes, which appear as irregular black patches when the sun is imaged in ultraviolet light or certain types of X-ray images, according to the space agency. Read more at the link in bio. 📷: NASA/GSFC/SDO