Cluster II was a space mission of the European Space Agency, with NASA participation, to study the Earth's magnetosphere over the course of nearly two solar cycles. The mission was composed of four identical spacecraft flying in a tetrahedral formation
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Butterflly Nebula NGC 6302 taken by the Hubble telescope
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“ The Cluster II mission has finished this September, Cluster-2 has already plunged into the Pacific Ocean
There were four spacecraft (additional links for info)
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