Cluster (spacecraft)

Cluster spacecraft are a group of four spaceships that fly together in space. They work together to help scientists learn more about how the Earth, Sun and space work. Each spacecraft has cameras, special instruments and sensors that measure different things, like the speed of the solar wind (the flow of gas from the Sun) and the strength of magnetic fields in space. By flying together and taking measurements at the same time these spacecrafts can learn more about how things in space move and interact.