How do Space Nuclear Reactors based on fission compare to RTGs in power generation capability?

Answer

Fission systems are designed for significantly higher output, potentially achieving several kilowatts compared to the few hundred watts typical of an RTG.

Nuclear fission, the process used in terrestrial power plants, offers a dramatically greater power density than the heat derived from radioactive decay utilized by RTGs. While an RTG might reliably produce a few hundred watts sufficient for basic communication and instrument operation over decades, Space Nuclear Reactors are engineered to generate much higher electrical outputs, often ranging from multiple kilowatts up to tens of kilowatts. This elevated power level is necessary to support demanding activities like advanced scientific instruments, high-speed electric propulsion, or sustaining infrastructure for permanent off-world bases.

How do Space Nuclear Reactors based on fission compare to RTGs in power generation capability?

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