Friedrich Christian Anton Lang, better known as Fritz Lang, was an Austrian-American film director, screenwriter, and producer who worked in Germany and later the United States. One of the best-known émigrés from Germany's school of Expressionism, he was dubbed the "Master of Darkness" by the British Film Institute. He has been cited as one of the most influential filmmakers of all time.

A rocket is a vehicle that uses jet propulsion to accelerate without using the surrounding air. A rocket engine produces thrust by reaction to exhaust expelled at high speed. Rocket engines work entirely from propellant carried within the vehicle; therefore a rocket can fly in the vacuum of space. Rockets work more efficiently in a vacuum and incur a loss of thrust due to the opposing pressure of the atmosphere.