Explorer I Sattellite
Explorer I was the U.S.'s first satellite on January 31, 1958.
It carried an instrument package developed by a team directed
by Prof. James A. Van Allen and along with data returned
by Explorer 3 (launched in March 1958) provided evidence for
what are now known as the Van Allen Belts. That discovery is considered
the first major scientific discovery of the space age.
The original back-up payload (identical to the one launched)
is on display at the
Air and Space Museum.
- Length: 80 in
- Diameter: 6 in (excluding antenna)
- Weight: 31 lb
- Launched by Jupiter-C Rocket
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