Passive
In space and astronautical engineering, passive refers to a type of thermal control system that does not require any active components such as pumps or fans. Passive thermal control systems rely on the use of materials and structures that can absorb, reflect, or radiate heat to maintain a stable temperature for spacecraft and their components. These systems are often used in situations where active thermal control systems are not feasible or practical, such as in small satellites or long-duration missions. Passive thermal control systems can include materials such as insulation, coatings, and radiators, as well as structural designs that maximize heat dissipation. The effectiveness of passive thermal control systems depends on a variety of factors, including the materials used, the design of the spacecraft, and the specific mission requirements.
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