NASA’s official Twitter shared this picture as the “smiling” sun on the occasion of Halloween. Say cheese! 📸 Today, NASA’s Solar Dynamics Observatory caught the Sun "smiling." Seen in ultraviolet light, these dark patches on the Sun are known as coronal holes and are regions where fast solar wind gushes out into space. pic.twitter.com/hVRXaN7Z31 — … Continue reading NASA shares picture of ‘Smiling Sun’