Wouldn't it be more cost effective if they launched multiple vehicles at at time instead of just one? Perhaps NASA could work with other nations by building more rovers and letting them launch their own. If it's going to be in the name of science, why not?
With all the self driving technology we have now, (and will have by 2020), why not make it faster, and give it a capability to cover 20 or 50 miles a day or some such.
The rovers we've sent really don't have the capability out of sight of their landing zone. That makes picking landing sites a huge challenge.
With a slightly taller vehicle with a wider stance (bigger wheels) you could probably cover most of the martian terrain at substantial speed, totally autonomously.
It could map as it went, and pick up soi
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