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Region around a planet (such as Earth) or a natural satellite that possesses a magnetic field (seegeomagnetic field) where magnetic phenomena and the high atmospheric conductivity caused by ionization strongly influence the behaviour of charged particles (seeelectric charge). A planet or moon's magnetic field, like its gravitational field, becomes weaker with distance from the body. The solar wind sweeps a body's magnetosphere out away from the Sun in a tail trailing well beyond it.
This entry comes from Encyclopædia Britannica Concise. For the full entry on magnetosphere, visit Britannica.com.