Cluster

A cluster is a group of stars whose members are genuinely associated. A cluster of stars is formed from the same gas/dust cloud. There are two main types: open and globular.

Cluster is also the name given to a group of four spacecraft that have been placed in Earth orbit in order to study the interactions between particles ejected from the Sun and the Earth’s magnetic field. The first attempt to put Cluster into space in 1996 failed when the Ariane rocket exploded. Oops.

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