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Поисковые слова: arp 220
The Exploration of the Earth's Magnetosphere"

Explorer I, First US Satellite


           

About 30" long, it was launched at the end of January, 1958, followed by Explorer III (similar) two months later.

Both carried Geiger counter radiation detectors to observe high energy particles from distant space.

Unexpectedly, they discovered the Earth's radiation belt.