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Explorer 4
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== Juno I launch vehicle == [[File:Juno-1 (Explorer 4).jpg|thumb|[[Juno I]] and Explorer 4 satellite]] The launch vehicle was a [[Juno I]], a variant of the three-stage [[Jupiter-C]] with an added fourth propulsive stage, which in this case was the Explorer 4. The first stage was an upgraded Redstone liquid-fueled rocket. The second stage comprised a cluster of eleven [[MGM-29 Sergeant|Sergeant]] solid-fuel rocket motors and the third stage held three Sergeants. The booster was equipped to spin the fourth stage in increments, leading to a final rate of 750 rpm about its long axis.<ref name="Display"/>
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