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Juno II was a launch vehicle developed by America's space program to enable boosting larger scientific payloads into space. The modified Jupiter C (sometimes called Juno I) that was used to launch Explorer I had minimum payload lifting capabilities, as Explorer I only weighed 31 pounds.

'''Juno II''' was a launch vehicle developed by America's space program to enable boosting larger scientific payloads into space. The modified Jupiter C (sometimes called Juno I) that was used to launch Explorer I had minimum payload lifting capabilities, as Explorer I only weighed 31 pounds.

Juno II successfully launched a Pioneer IV satellite on March 3, 1959, and an Explorer VII satellite on October 13, 1959. Pioneer IV passed within 37,000 miles of the [[moon]] before going into permanent solar orbit. Explorer VII had a total weight of 91.5 pounds and carried a scientific package for detecting micrometeors, measuring the Earth's radiation balance, and conducting

Juno II successfully launched a Pioneer IV satellite on March 3, 1959, and an Explorer VII satellite on October 13, 1959. Pioneer IV passed within 37,000 miles of the [[moon]] before going into permanent solar orbit. Explorer VII had a total weight of 91.5 pounds and carried a scientific package for detecting micrometeors, measuring the Earth's radiation balance, and conducting