Tags: Artificialsatellite, Satellite.
Cluster II is a space mission of the European Space Agency with NASA participation to study the Earth’s magnetosphere over the course of an entire solar cycle. The mission is composed of four identical spacecraft flying in a tetrahedral formation. A replacement for the original Cluster spacecraft which were lost in a launch failure in 1996 the four Cluster II spacecraft were successfully launched in pairs in July and August 2000 onboard two Soyuz-Fregat rockets from Baikonur Kazakhstan.