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James Van Allen, his colleagues, associates and students at The University of Iowa continued to fly scientific instruments on sounding rockets, Earth satellites (Explorer 52 / Hawkeye 1), and interplanetary spacecraft including the first missions (Pioneer program, Mariner program, Voyager program, Galileo spacecraft) to the planets Venus, Mars, Jupiter, Saturn, Uranus, and Neptune. Their discoveries contributed important segments to the world's knowledge of energetic particles, plasmas and radio waves throughout the solar system.