It’s not going to happen.
No, really. No one alive today will ever live on, or travel to, another planet. Sorry.
The challenges are astounding. Earthlings aren’t readily adaptable to living off planet. We can’t even live on most of the Earth!
At 10,000 feet above sea level our breathing is already labored. We can’t live very far below ground either.
We can’t live in the sea. We can’t live where it’s too hot or cold. We can’t live where it’s too dry or too wet.
This comes to mind because the International Space Station is experiencing plumbing problems.
Earlier Wednesday, the pump module on one of the space station’s two external cooling loops automatically shut down when it reached pre-set temperature limits. These loops circulate ammonia outside the station to keep both internal and external equipment cool. The flight control teams worked to get the cooling loop back up and running, and they suspect a flow control valve actually inside the pump module itself might not be functioning correctly. – NASA
It is all we can do, we being a dysfunctional international consortium of governments that runs the space station, to keep a handful of scientists safely in orbit 257’ish miles up.
Going to a planet is much, much more complicated. Farther away–distance and time. More hostile environment. We’re nowhere near ready to solve these problems.
Up on the ISS there’s hope a cooling solution will be found. Since this is an external problem, repairing it will probably require a trip, or two, or more, outside.
As amazing as astronauts making repairs on their space station while in orbit is, going to a distant planet is orders of magnitude more difficult and more expensive.
It’s just not practical and it never will be.