Since we recently did a study of this in my classes. I'd like to take input here.
There is an earth like planet out there. It's within our Galaxy but out of reach for now. It is way larger than Earth. With Over-Population reaching its limit in the next century or two, they would start building ships very soon to travel there. Bringing the best scientist there first to tests its living quality, then once they give the go, I believe they'll start bringing some of the population piece by piece to this new Earth.
Though, for now I'm pretty sure they're still even trying to figure out the mode of transportation. So I don't believe I see our generations going to this new earth..



