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'''STEREO''' ('''Solar Terrestrial Relations Observatory''') is a [[Sun|solar]] observation mission.<ref>{{cite web |url=http://www.nasa.gov/missions/highlights/schedule.html |title=NASA Launch Schedule |publisher=NASA |date=September 20, 2006 |access-date=September 20, 2006}}</ref> Two nearly identical spacecraft were launched in 2006 into orbits around the Sun that cause them to respectively pull farther ahead of and fall gradually behind the Earth. This enabled [[stereoscopic]] imaging of the [[Sun]] and solar phenomena, such as [[coronal mass ejection]]s.
Contact with STEREO-B was lost in 2014 after entering an uncontrolled spin preventing its solar panels from generating enough power, but STEREO-A is still operational.
==Mission profile==
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