How Many People Would We Need To Colonize Another Earth?

Various companies are working to settle on other planets. How long would it take and what issues would we face along the way?
Source: DNews
Read more:
Space Future
Space Exploration Books
Spaceships & Rockets
The Future of Mars Exploration
The Future of Moon Exploration
Asteroid Mining
Space Colonization, How Many People Would We Need To Colonize Another Earth

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