Burning Blue

This large beautiful image of the sun looks more like something you'd find in the depths of the ocean.

"Among the first images taken by STEREO’s SECCHI/Extreme Ultraviolet Imaging Telescope, the image shows the Sun’s roiling surface and atmosphere at temperatures around one million Kelvin (1.8 million degrees Fahrenheit). The ultraviolet light in this range is not typically visible to the human eye, so it is represented here in blue."

More info here.