[issa]

I just think it is a case of thinking small. A few key advances and all the problems are solved. For example:

- Increased lifespan making the trip possible in 1 generation - A hollowed out asteroid or other extremely large biosphere. It is not hard to imagine something large enough to overcome the ecological problems - Virtual reality (the holodeck) if you're still worried about social issues in a large space. BTW, most teens today would be happy to stay in a closed room, as long as they had a phone. (I exaggerate, but only a little)

All of these things are reasonable extrapolations of existing tech. In 200 years, I'm sure a whole lot more will be possible.

[tivert]

> A few key advances...

Understatement of the year.