The Soviet space program to Venus in the late 1960's, 70's, and early 80's was very successful, with 13 of 16 Venera missions safely reaching the planet. Each Venera spacecraft was designed to either orbit Venus, probe its atmosphere, or reach its surface. Each mission gained new, valuable information, but it took much trial and error before the Soviets learned how to survive the extreme pressure of Venus' atmosphere and peer through its dense cloud cover from orbit.
Veneras 4 (in 1967), 5, and 6 (in 1969) were all probes that accumulated data on the composition of Venus' atmosphere.
The 7th through the 14th Venera missions all successfully landed on Venus, each spacecraft spending a longer time on its surface than the previous one. Venera 10 returned the first black and white photographs of its terrain, while Venera 13 sent back the first color photos. The Venera missions also measured surface temperature, detected lightning, and analyzed the Venusian soil.
The last Venera installments, launched in 1983, included two orbiters that used special radar to map the region around Venus' north pole. Despite the success of the Venera missions and the amount of interesting information they accumulated, budget problems and political instability in the area which used to be the Soviet Union threaten the chances of future missions to Venus.
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