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Living on Mars is not a long term solution, because you cannot terraform Mars.
If you want to colonize another planet you must be able to terraform it.
But since mars has no magnetic field it will not shield the planet and retain a livable atmosphere for humans.
If you want to colonize another planet you must be able to terraform it, and if you must be able to terraform it the planet must have a magnetic field.
Solar flares is not enough.
Mars is not it, our next planet is has yet to be discovered.
From the research I’ve seen, terraforming is possible by creating a greenhouse effect but it’s not a long term solution like you said. It’s too small to maintain a thick atmosphere like the one on earth as well as there being no magnetic field which leaves you at the mercy of cosmic rays. These deficiencies is part of why it became how it became in the first place.
Also, one of its asteroid moons is destined to crash into the planet so that’s a disaster waiting to happen.
NASA Believes It Knows How To Make Mars Green Again
NASA proposes building artificial magnetic field to restore Mars' atmosphere - ExtremeTech