The resulting three-dimensional image of the sun

STEREO (Eng. Solar TErrestrial RElations Observatory) - NASA mission to study solar activity. Two identical spacecraft were launched on October 26, 2006. It is assumed that one of them will gradually lag behind the Earth, and the other, on the contrary, will overtake it. This will allow you to simultaneously observe the entire surface of the Sun and study the phenomenon of coronal mass emissions. Also such an arrangement can significantly improve the accuracy of solar activity forecasts.