Venera 4, launched June 12, 1967, is the first spacecraft to survive entry into another planet's atmosphere. The Soviets sent Venera 4 to Venus, and it arrived October 18, 1967 and entered the Venusian atmosphere. The descent lasted 93 seconds, but it managed to relay some important information. It measured temperature at 504 °F and pressure at 22 x the Earth's. Atmospheric composition was determined to be 90-93% carbon dioxide, 7% nitrogen, 0.1-1.6% water vapor and 0.4-0.8% oxygen.
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