In Pictures: NASA's hot radiation mission

NASA is set to launch its Radiation Belt Storm Probes (RBSP) to explore the most intense areas of radiation around Earth

NASA facts about radiation: Two radiation belts filled with electrons and charged particles surround Earth. The inner one is fairly stable, but the outer one swells and shrinks over time. When the inner belt swells, this region of dangerous radiation expands to include the orbits of the International Space Station and many other satellites.

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