Goals: Pioneer 6 was the first in a series of solar orbiters designed to measure, from widely separated points in space on a continuing basis, interplanetary phenomena such as the Sun's magnetic field, the solar wind, and solar and galactic cosmic rays.

Accomplishments: Pioneers 6, 7, 8, and 9 formed a ring of solar-weather stations, spaced approximately along Earth's orbit, whose measurements were used to predict solar storms. Pioneer 6 returned the first data on the Sun's atmosphere and recorded passage of Comet Kohoutek's tail.

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