Just like our computers, our rovers need to be miniaturised: its package volume needs to be as small as possible, as small in relation to a rover as a smartphone in relation to ENIAC, perhaps a thousandth the weight of a rover so that it would also only require a thousandth the fuel and almost a thousandth the cost. It could just be a camera looking out the side of a single motorised wheel. We could use a high-altitude balloon to get the rocket into the stratosphere (even high school projects have reached 60 km), where the high-speed winds will give it a boost of up to 100km/hour, bringing it that much closer to escape velocity. The only problem then would not be resources as much as figuring out the ballistics.
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