Explorer 7
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Explorer 7, launched 13 October 1959, was the last of the satellites developed for use during the International Geophysical Year. It was much heavier than its predecessor satellites and equipped with
Explorer 7 satellite
Cutaway of Explorer 7
The ignition of Juno II (AM-19A). Juno II (AM-19) successfully placed a physics and astronomy satellite, Explorer VII, in orbit on October 13, 1959
Vanguard 3
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Vanguard 3 is a scientific satellite that was launched into Earth orbit by the Vanguard SLV-7 on 18 September 1959, the third successful Vanguard launch out of eleven attempts. Vanguard rocket: Vangua
Explorer 7
…terms of incident solar radiation due to both the saturation of detector circuits by Van Allen radiation (150 keV electrons) (as had also happened on Vanguard 3 ) and electronic difficulties in the feedback amplifier. Successful measurement of solar X-rays would have to wait for next year's SOLRAD 1, which also…
Vanguard 3 satellite
Launch of Vanguard 3 on Vanguard SLV-7 rocket