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The Tsiolkovsky Formula
Konstantin Tsiolkovsky, a Russian mathematician, developed a formula that facilitated the use of liquid fuel for the launching of Space Craft. This development is used to this day for the launch of space craft and the adjustment of speed and direction of space vessels. -
Rockets to the Moon
Robert Goddard, after establishing the idea that space ship launches to the moon are possible, create the very first liquid fueled rocket, which was launched on March 16th, 1926.