But the weight of the needed solar equipment would go up to more than 20 tons for a Mars outpost closer to the poles. Mars is tilted on its axis by about 25 degrees, slightly more than Earth is, and its orbit is less circular, so less sunlight would reach those PV cells during parts of the year. That means nuclear power becomes more viable at the poles. The power generation equipment needed to produce that much nuclear energy would add up to about 9.5 tons of carry-along mass to produce the same 40 kilowatts of energy. That lift is doable for massive next-generation rockets like NASA’s Space Launch
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