Category
page 1Spacecraft using Lissajous orbits
Herschel Space Observatory
former ESA space observatory
Gaia
European Space Agency astrometric mission
Wilkinson Microwave Anisotropy Probe
NASA Cosmic Microwave Background probe launched in 2001
Planck
former ESA space observatory
Chang'e 2
Chinese Moon orbiter
Genesis
NASA sample return probe

THEMIS
Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission began in February 2007 as a constellation of five NASA satellites (THEMIS-A through THEMIS-E) to study energy releases from Earth's magnetosphere known as substorms, magnetic phenomena that intensify auroras near Earth's poles. The name of the mission is an acronym alluding to the Titan Themis.
Advanced Composition Explorer
NASA scientific satellite
Deep Space Climate Observatory
American solar research spacecraft