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Martian parents will indicate a point of light in the sky as Earth to their children, and these children may or may not be interested depending on their inclination to astronomy (for Earth would now be an object of astronomy), but their lives will be on Mars, i.e., Mars will be the site of the lived experience of planetary endemism, and the lived experience of planetary endemism is the homeworld effect.
One can imagine, whatever the comforts of a well-constructed artificial habitat, that the residents of O’Neill cylinders (as well as Stanford toruses and Bernal spheres, if such are built), if they are born on Earth, will continue to think of Earth as their homeworld, and this will result in the societies of artificial habitats being more tightly-coupled to terrestrial civilization than Martian societies.
They were trying to figure out which stars could host a planet that was not so hideously uninhabitable that no possible form of life could live there.
In other words, many of these planets could host alien life forms but would quickly kill an unprotected human being.
Human instincts for planetary life will be seamlessly exapted for life on Mars, and, farther in the future, for life on other planets.
The Martian settlers would have a homeworld, albeit a homeworld other than Earth.
The equations were derived by me using an analysis of the Habcat database, and thus could be wildly inaccurate.
The galaxy—what tiny part of it we can ever control—cares not one quantum whether their youthful greed and boldness overcome our wearied satiety and caution. Think just of the approximately one hundred thousand whose planets we do visit, occupy, order about, accept tribute from. A hundred thousand; no more; you could count that high in about seven hours. Then consider a planet, a world, as big and diverse and old and mysterious as ever Terra was. And I am a specialist in worlds and the beings that inhabit them. Did I not, a few years ago, watch the total destruction of one?
While living on Mars will not be easy, it will be far more planet-like than living in an entirely artificial habitat.
We are the kind of beings that evolve on a planetary surface, i.e., our bodies and our minds both were shaped by our planetary endemism, and this homeworld effect is expressed in our characteristic modes of life and thought.
Certainly our admiral's call for help took long to go through channels: "We're having worse and worse trouble with the hinterland savages. One civilian xenologist, under contract to investigate, report, and recommend appropriate action. If your first-in scouts have given you the luxury of lots of human-habitable worlds to choose your colony sites from, naturally you will pick the ones closest to being paradise planets.
If all the planets range from miserable hell-holes to utterly uninhabitable you have roughly five options: The divergence of human exocivilizations both from terrestrial civilization and from each other will be in evidence to the careful observer early on in their development.