Advanced Solar-Electric Energy: Part I

I wouldn't be surprised if concentrated solar energy was used out at Neptune. Just needs to be larger. And for a power station, that's not necessarily an issue. You get less power to mass, but that's only important if you're worrying about mass. If we get to a point where we need a power station at Neptune, then shaving off the grams likely wouldn't be a serious concern, since we'd probably have advanced propulsion tech that could actually put useful payloads there with high efficiency.

Of course there are alternatives. What gets used would depend on the circumstances of the situation.Advanced Solar-Electric Energy: Part I

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