How Many People Does It Take to Colonize Another Star System?
A multigenerational journey between stars would require a lot more passengers than scientists previously thought.
Popular Mechanics said:
It was a valiant attempt to solve a thorny question about the future of humans in space. The nearest star systems—such as our nearest neighbor, Proxima Centauri, which is 4.2 light-years from home-are so far that reaching them would require a generational starship. Entire generations of people would be born, live, and die before the ship reached its destination. This brings up the question of how many people you need to send on a hypothetical interstellar mission to sustain sufficient genetic diversity. And a new study sets the bar much higher than Moore's 150 people.