Though current data and predictions
aren't entirely conclusive, the chances a catastrophic impact with an
asteroid could occur are around once every thousand years. In the
future, if such a case is forecast, earth inhabitants might have
another reason to relocate. There are a number of other events that
could cause earth to become uninhabitable, so exploration to find
other worlds to colonize would become a greater priority if a
disastrous event was determined for the future. Other catalysts that
might cause off-world colonization to become a priority could include
a massive nuclear war, extreme pollution, a deadly outbreak, or even
an encounter with an advanced alien species. It is difficult to say
what might compel us to make another world our home, but more and
more, it appears closer on the horizon.
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