ESA’s Cluster satellites in closet-ever ‘dance in space’

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Since 2000, the four identical satellites of the Cluster quartet have been probing Earth’s magnetosphere in three dimensions. This week, two of them made their closest-ever approach, just 4 km, enabling valuable data to be acquired with unprecedented detail.

via ESA Space Science

http://www.esa.int/Our_Activities/Operations/ESA_s_Cluster_satellites_in_closet-ever_dance_in_space