When the Sun's Surface Erupts

Arc-like solar prominences like these form when hot gaseous matter erupts from the sun, then is drawn back to the solar surface by strong magnetic fields.

Solar prominences, which are the most common solar activity, don't disappear instantaneously; in fact, they can last for months. They can also extend for thousands of miles above the solar surface and release the gas they contain into space.

Image: Thierry Legault