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Given that there will be no fuel stations on Mars when Earthlings first start to explore it, I think that long range rovers, capable of carrying one or more humans, powered by electricity generated by radioisotope power supplies similar to the two Viking landers would be much more practical and reliable than solar powered rovers or fuel cell powered rovers.
The driving range of future rovers, manned and unmanned, must be increased to double or triple digit miles per day.
Ron Carlson
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