An @esa/@NASA solar observatory saw this 'reindeer' on the Sun in 2003! 🦌

The dark area that forms the reindeer is a coronal hole — a magnetically open region on the Sun that is a source of high-speed solar wind particles. https://t.co/e3yNMiBGLn pic.twitter.com/T82CHddLIL

— NASA Sun & Space (@NASASun) December 24, 2017