Space.com #Edge of the Sun Determined and Imaged – Where Solar Wind Begins | Video 2 September 2016 fborgosano Leave a comment Share: Using NASA’s Solar Terrestrial Relations Observatory (STEREO), the edge of the Sun’s atmosphere, known as the corona, has been imaged. There is a a visible change in the solar material as it transitions into solar wind. from Space.com ift.tt/2bIdctx Share: