Vacuum Tube
In space and astronautical engineering, a vacuum tube is an electronic device that consists of a sealed glass tube from which all the air has been removed to create a vacuum. The tube contains electrodes, which are heated to release electrons into the vacuum. These electrons are then manipulated and controlled by other electrodes within the tube to amplify or switch electronic signals. Vacuum tubes were widely used in early electronic systems, including in spacecraft and satellites, due to their reliability and durability in harsh environments. However, they have largely been replaced by solid-state electronics in modern space systems.
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