TMK

TMK (Russian:Тяжелый Межпланетный Корабль - Tyazhely Mezhplanetny Korabl for Heavy Interplanetary Spacecraft) was the designation of a Soviet space exploration project to send a manned 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. Expanded project variations, such as the TMK-E, Mavr or KK, including a Venus flyby, electric propulsion or a manned Mars landing were also proposed.