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Stereo probes

Solar TErrestrial RElations Observatory is the third mission in NASA’s Solar Terrestrial Probes program. This two-year mission will trace the flow of energy and matter from the Sun to Earth. It will reveal the 3D structure of coronal mass ejections; violent eruptions of matter from the sun that can disrupt satellites and power grids, and help us understand why they happen.


A giant plume of hot gas explodes from the Sun's surface. Giant bubbles of hot g

Our Star, the Sun June 8, 2006

Featured Images

View of Comets ISON and Encke from a Sun-watching spacecraft

Sizzling Comets November 27, 2013