STEREO (for Solar Terrestrial Relations Observatory) is two satellites in solar orbit able to take stereo images of solar phenomena. They were launched in 2006. Contact with one the two (STEREO-B) was lost in 2014 and has been out of use since, but the other (STEREO-A) is still collecting data as of 2019. Instruments included:
STEREO can also observe stars and has discovered over 100 eclipsing binaries.