ADE (Air Density Explorer)
Although Explorer 9 was the first such balloon launched (as well as being the first satellite placed in orbit by an all-solid-propellant rocket and the first to be successfully launched from Wallops Island), only its three identical successors were officially designated "Air Density Explorers."
ADE was a subprogram of NASA's Explorer series.
Related category• SATELLITES AND SPACE PROBES
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