If Mars hosted an ancient civilization of some kind and/or was more earth-like before some catastrophe and/or has current life of any variety then it would certainly be worth exploring. Phobos is pretty quirky, too, as far as moons go.
I think we should explore everywhere we can possibly reach, though, and should look long term at colonization off earth. We're one event away from extinction, no matter how remote that possibility is, if we're only in one place. I don't think it will be pretty, or fair, when we start to migrate, but it needs to happen.
And it's taken these ****ers long enough to get to Europa. Be 20 years behind by the time we get there!
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