NASA launches its first interplanetary spacecraft, the unmanned space probe Mariner 2, en route to Venus. During its three-month trip from Earth to Venus, Mariner 2 takes measurements of solar wind, charged particles, and an experiment is included to measure the amount of dust and micrometeoroids between the two planets. The probe briefly loses attitude control several times in flight, but regains proper orientation in each instance.
Mariner 2 launched
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