magnetosphere
mag·ne·to·sphere
noun \mag-ˈnē-tə-ˌsfir, -ˈne-\Definition of MAGNETOSPHERE
: a region of space surrounding a celestial object (as a planet or star) that is dominated by the object's magnetic field so that charged particles are trapped in it
— mag·ne·to·spher·ic \-ˌnē-tə-ˈsfir-ik, -ˈsfer-\ adjective
See First Known Use of MAGNETOSPHERE
1959
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