NASA’s THEMIS-ARTEMIS mission is made up of two probes: P1 and P2. They were originally part of the successful THEMIS (Time History of Events and Macroscale Interactions during Substorms) mission that orbited Earth and studied the aurora. NASA redirected the two probes to the Moon, where they became the ARTEMIS (Acceleration, Reconnection, Turbulence and Electrodynamics of the Moon’s Interaction with the Sun) mission.
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