What was notable about the Explorer 3?
It was the first manned spacecraft
It carried Van Allen's instrument
It was the first to land on the moon
It was the biggest satellite of the time
Answer
Explorer 3 carried Van Allen's instrument, which measured the radiation levels around the Earth. The results showed that there were two radiation belts around the Earth, which are now known as the Van Allen radiation belts.
Exploring the Outer Limits: The James Van Allen Quiz
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