https://www.space.com/3040-nasa-stereo-spacecraft-sun-watching-mission.html
NASA's STEREO Spacecraft Begin Sun-watching Mission | Space
Oct 26, 2006 - A pair of Sun-watching satellites launched into the night sky above Florida late Wednesday, kicking off a NASA mission to take three-dimensional (3-D) images...
stereo spacecraftsun watchingnasabeginmission
https://www.universetoday.com/articles/stereo-spacecraft-provides-first-complete-image-of-suns-far-side
STEREO Spacecraft Provides First Complete Image of Sun's Far Side - Universe Today