What engineering trade-off distinguishes an RTG's strength compared to a fission reactor?
Answer
Guaranteed longevity and inherent reliability versus raw power density
The choice between an RTG and a fission reactor highlights a fundamental design trade-off driven by mission requirements. The primary advantage of the RTG lies in its simplicity and inherent reliability; since it operates purely on the predictable decay of its fuel source, it typically has no moving parts required for power generation, leading to operational lifetimes spanning decades. In contrast, fission reactors, while capable of far greater power output (higher power density) and offering the flexibility to be turned on or off, introduce greater operational complexity and safety considerations that can affect long-term reliability compared to a sealed RTG.
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