This is a drawing of the Earth and its radiation belts.
Click on image for full size
The Discovery of the Radiation Belts
In 1957, Russia launched Sputnik 1
, the first spacecraft to ever be launched. Americans wanted to send up a satellite too. They sent up Explorer I.
Even though this was America's first satellite, Explorer I made a huge discovery. Explorer I made measurements that helped Dr. Van Allen discover the radiation belts.
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