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Explorer 9 was the first in a series of 3.66-m inflatable spheres placed into orbit solely for the determination of atmospheric densities. The spacecraft consisted of alternating layers of aluminum ... foil and plastic film. Uniformly distributed over the aluminum surface were 5.1-cm dots of white paint for thermal control. Explorer 9 carried a 136-MHz beacon for tracking purposes. The beacon failed on the first orbit however, and the SAO Baker-Nunn camera network had to be relied upon for tracking. The spacecraft reentered the earth's atmosphere on April 9, 1964.
Wallops Flight Facility, Wallops Island, USA