What is the specific, non-power generating role of a Radioisotope Heater Unit (RHU)?
Answer
To generate a steady, low level of heat to prevent vital electronics from freezing.
The Radioisotope Heater Unit (RHU) is structurally simpler than an RTG as it is not designed to produce electricity for operational systems. Instead, its sole purpose is thermal management in the extreme cold encountered during deep space operations or during long periods of shadow. By containing a small amount of radioactive material, the RHU ensures that sensitive components, such as wiring, batteries, or scientific sensors, maintain temperatures above their freezing points. This function is crucial for maintaining the long-term operational integrity of a spacecraft when primary power sources might not be available to supply necessary warmth.
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