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For interplanetary travel, nuclear power is typically favored due to its ability to provide a sustained and reliable source of energy over long durations, which is essential for missions that require extensive travel times and the ability to operate in the harsh environments of space.

Nuclear power systems, such as radioisotope thermoelectric generators (RTGs), harness the heat generated from radioactive decay to produce electricity. This method is advantageous because it does not rely on solar radiation, which can be weak or unavailable in the vast distances of space, particularly in the outer solar system. Furthermore, nuclear power offers higher energy density compared to chemical power sources, allowing spacecraft to carry less fuel while generating more energy.

While solar power can be effective for missions closer to the Sun, reliance on solar panels decreases as spacecraft move farther from it. Chemical power is typically suited for launch and short-duration missions due to its high thrust but is less efficient for the prolonged energy demands of interplanetary travel. Hydraulic power, on the other hand, is generally not employed in space travel because it relies on fluid mechanics, which are not practical in a vacuum environment.

Thus, nuclear power stands out as the most suitable option for interplanetary voyages, capable of providing the necessary energy for a