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When we do finally send people to Mars I think they'll appreciate having a local copy of Wikipedia with them. This would be one of the top 10 resources beyond what's required to produce air, food, water, and heat. Otherwise, something comes up and any question you have could take almost an hour to get a response from someone on earth.

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That's easy (much easier than to get to Mars): Download your dump from http://download.kiwix.org/zim/wikipedia/ and extract it with https://github.com/dignifiedquire/zim

Now you have a fully static Wikipedia copy, running wherever you want it to :)

Wikipedia is, by my estimate, to 90% about animals, places, historic places, historic animals, historic people, "notable" living people, and so on. How's that going to be relevant on mars? And who's going to vet all the articles?

Maybe, but those 1% remaining (thousands of articles) about physics, engineering, and so on are a goldmine if you are stranded without anything else.

It would be dumb no to take it as the complete dump is < 1Tb

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