4.18. In Wikipedia, look up "Magnetosphere" and answer this question: What is a magnetosphere?a. The core of a planet where a magnetic field is generated.b. A region of space surrounding an astronomical object in which charged particles are affected by that object's magnetic field.c. A spherical magnetic that only has a single magnetic pole.d. A zone of energetic charged particles, most of which originate from the solar wind, that are captured by and held around a planet by that planet's magnet field.

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