Source: http://thewatchers.adorraeli.com/2015/07/16/stereo-a-spacecraft-returns-data-from-the-far-side-of-the-sun/
The image below is from the Extreme Ultraviolet Imager, which collects images in several wavelengths of light that are invisible to the human eye. By triangulating the views from STEREO and solar observatories closer to Earth such as the joint ESA and NASA Solar and Heliospheric Observatory, scientists can create a full 3-dimensional model of coronal mass ejections, or CMEs.