Cluster II (spacecraft)

Cluster II is a group of four spacecraft (space ships) that were sent into space by the European Space Agency. The four spacecraft are connected together and move around in space together in a group, which is known as a cluster or a formation. The spacecraft are studying the Earth's magnetic field, solar winds, and radiation coming from the sun. They are helping scientists understand how the sun affects the Earth's atmosphere, which can help us better predict weather patterns.