Venera 16, a Soviet spacecraft to Venus launched June 7, 1983, entered into orbit around the planet just one day after its twin sister Venera 15, although Venera 15 was launched only 5 days earlier. Venera 16 entered a nearly polar orbit and, together with its twin, they mapped about 25% of Venus's surface over the course of 8 months. The last data received from Venera 16 was on June 13, 1985.
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