I think it’s a great question you posed and one with exploring, no pun intended

People can’t just persist there. Survival alone requires technological feats never-before seen in human history. You need to raise the temperature hundreds of degrees, you need oxygen, and you need to account for psychological factors like a lack of sunlight or knowing certain death is a certainty outside the human created environment in which you live.

You can’t just drop people off and say “see you in three years!”.

Sure, I think reproducing as well. But you may have had different ideas when you said colonize. Creating a mining colony is very different than creating a colony for people to establish themselves for generations.

And in 1969 everyone thought we’d be on Mars by the end of the century. That being said I am hopeful we make it to Mars in my lifetime. But I also know that overseas wars and the military will always siphon the incredibly large majority of our tax dollars. Geopolitics can derail achievement in space at any moment.

Whatever profit is to be made will not be enjoyed by those who start this kind of work. They will be long dead. The initial cost of this work would be in the trillions.

And the humanity that colonizes another celestial body will bear little resemblance to us.

OP didn’t say build a base. He said colonize.

I studied history. Periods of human enlightenment are short lived and interspersed between long periods of difficulty. To actually colonize a hostile object beyond Earth would require a level of cooperation and scientific focus never-before seen in human history.

So, 500 generations maybe?

You think we can colonize Callisto in 200 years???

How many generations of work and technological advancement in physics, engineering, biology, chemistry, materials science, medicine, etc. do you think it would take to colonize Callisto? Off the top of my head I would say 500 generations.

They didn’t eat so much processed food and their daily lives typically had fewer sedentary hours.

The best description of Dylan I ever heard was “you either get it or you don’t”. For the people who “get it” Dylan strikes a deep chord, or as Van Ronk said in the Scorsese documentary, “if you believe in such a thing, Dylan tapped into the collective unconscious”. For those who don’t “get it”, Dylan’s popularity is confusing as hell.