Why were the lunar lander's rockets silent?
As the lunar lander descended toward the surface of the moon for landing, the rockets were firing. Why did they not make any noise inside the cockpit? When you listen to Neil Armstrong and Buzz Aldrin talking, you can't hear any rockets.
The answer is that the noise of a rocket engine is created by the interaction of the propellant exhaust and the surrounding atmosphere. No atmosphere, no noise.
There may have been a low level of noise in the cockpit due to vibration, but the astronauts used specialised communication microphones which were positioned right next to their mouths. These microphones are specifically designed to eliminate background noise.
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Author: Dave Owen.