Before the U.S. exploded a nuclear bomb high over the Pacific early this summer, famed Physicist James Van Allen predicted that the blast would create a globe-girdling belt of dangerous radiation. Last week data from orbiting Injun I satellite proved him correct. The new belt is 200 to 500 miles high, just a little closer to earth than the permanent belt named after Discoverer Van Allen. But its intensity is waning, and by the end of a year it will be almost undetectable.
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