TMK (Russian: Тяжелый Межпланетный Корабль, romanized: Tyazhelyy Mezhplanetnyy Korabl', lit. 'Heavy Interplanetary Vessel') was the designation of a Soviet space exploration project to send a crewed flight to Mars and Venus (TMK-MAVR design) without landing. The TMK-1 spacecraft was due to be launched in 1971 and make a three-year-long flight including a Mars flyby, at which time probes would have been dropped.
TMK (Russian: Тяжелый Межпланетный Корабль, romanized: Tyazhelyy Mezhplanetnyy Korabl', lit. 'Heavy Interplanetary Vessel') was the designation of a Soviet space exploration project to send a crewed flight to Mars and Venus (TMK-MAVR design) without landing. The TMK-1 spacecraft was due to be launched in 1971 and make a three-year-long flight including a Mars flyby, at which time probes would have been dropped.
Source: Wikipedia "TMK" · CC BY-SA 4.0
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