See 53.
I agree about robots, but not about Mars and the Moon being habitable.
If humans cannot walk around without being sealed within a self-contained environment in a pressurized space suit, breathing the local atmosphere, in a temperature range that won’t kill them, then the place by definition is not habitable.
I should have said survivable.
Every other place in the solar system...
No solid ground.
Too hot.
Too much radiation.
Not enough gravity.
Pluto might be survivable, but bring a winter coat.