"Most accessible" is still very much a concept than concrete. We don't know how to build a free-floating colony, and Mars has far more water than Venus. Then a

"Most accessible" is still very much a concept than concrete. We don't know how to build a free-floating colony, and Mars has far more water than Venus. Then again, we don't know how to build a colony on Mars any better than we can build a colony on an oil rig platform in the ocean, or build a colony in LEO. Even our colonies on Antarctica - Esperanza Base and Villa Las Estrellas - aren't able to grow their own food. In any case, Mars is a better colonization target than both Mercury and Io. Resource extraction does not require colonization. We have robots.