SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Venera 4, Soviet Venus space probe. The Venera series of probes were used to explore the planet Venus. Venera 4, launched in 1967, was designed to study the Venusian atmosphere. On October 18, 1967, the Venera 4 descent vehicle entered the planet's atmosphere. It continued to transmit data until the signal was lost after falling to an altitude of 25 kilometres. It provided the first chemical analysis of the Venusian atmosphere, showing it to be primarily carbon dioxide with small quantities of nitrogen, oxygen and water vapour.
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