If you look just right, the Sun appears to be opening its mouth and laughing at us. As ScienceAlert reports, this "hole" on the Sun is what's known as "coronal hole," which occurs when the star's magnetic field opens up and allows a gust of charged solar wind to rush out, leaving the area it just left much cooler and giving it that gaping look. When looking at the Sun from Earth — which we recommend only doing with special glasses, by the way — you won't notice its wide grin unless viewing it on the ultraviolet (UV) spectrum. From that […]