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Russian Konstantin Eduardovitch Tsioldovsky ( 1857-1935 ), known as "Rocket Man" and Father of "The Physics of Zero Gravity", implements Newton's 3rd Law of Motion for 'every action, there is an equal but opposite reaction'.
The essence of Tsiolkovsky's classical rocket formula is simple enough: in order to achieve "escape velocity", the ratio of fuel mass to the weight of the rocket must be at least 4:1 in favor of the fuel where the rocket itself must be multi-staged.
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Neil Armstrong, July 20, 1969: "Houston, Tranquility Base here, the Eagle has landed!"
Apollo 15 Moon Landing, began July 26, 1971 ended August 7, 1971: "Flying Down to Hadley Rille", by Commander David Scott and Lunar Module Pilot James Irwin spent three days on the Moon, including 18½ hours outside the spacecraft on lunar extra-vehicular activity (EVA), was NASA's most successful manned lunar mission accompanied by the first use of a lunar rover happening one decade after the first Mercury astronaut launch.
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