What is tmk?

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.

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Some articles on tmk:

TMK - KK - Space Complex For Delivering A Piloted Expedition To Mars
... lbf ea 61 N Performance Endurance 630 days 30 days Mars stay In 1966, a final version of the TMK studies was known as KK - Space Complex for Delivering a Piloted ...