- VanAllen belt
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Van Al·len belt (văn ălʹən)
n.
Either of two zones of high-intensity particulate radiation trapped in Earth's magnetic field and surrounding the planet, beginning at an altitude of about 800 kilometers (500 miles) and extending tens of thousands of kilometers into space.[After James AlfredVan Allen (born 1914), American physicist.]
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Universalium. 2010.