By Michael LaBossiere
If humanity remains a single planet species, our extinction is all but assured—there are so many ways the world could end. The mundane self-inflicted apocalypses include such things as war and environmental devastation. There are also more exotic dooms suitable for speculative science fiction, such as a robot apocalypse or a bioengineered plague. And, of course, there is the classic big rock from space scenario. While we will certainly bring our problems with us into space, getting off world would dramatically increase our chances of survival as a species.
While species do endeavor to survive, there is the moral question of whether or not we should do so. While I can easily imagine humanity reaching a state where it would be best if we did not continue, I think that our existence generates more positive value than negative value—thus providing the foundation for a utilitarian argument for our continued existence and endeavors to survive. This approach can also be countered on utilitarian grounds by contending that the evil we do outweighs the good, thus showing that the universe would be morally better without us. But, for the sake of the discussion that follows, I will assume that we should (or at least will) endeavor to survive.
Since getting off world is an excellent way of improving our survival odds, it is somewhat ironic that we are poorly suited for survival in space and on other worlds such as Mars. Obviously enough, naked exposure to the void would prove fatal very quickly; but even with technological protection our species copes poorly with the challenges of space travel—even those presented by the very short trip to our own moon. We would do somewhat better on other planets or on moons; but these also present significant survival challenges.