The sun is a very active place. The circular feature shooting out from the sun is an eruption. The little picture of Earth has been placed next to this eruption to show how big these eruptions are. (Earth is not really that close to the sun!) The sun is bright orange in this view. It was taken in the extreme ultraviolet, a wavelength of light that our eyes cannot see but spacecraft instruments can. Scientists use this view to reveal activity at the sun that would otherwise go unnoticed. One thing learned from ultraviolet views is how large the sun's eruptions are.
NASA's Solar Dynamics Observatory took this image.
Image credit: NASA/GSFC