The Next 500 YearsDo we have a moral duty to colonize other planets and other solar systems? An argument that we have a moral duty to explore other planets and solar systems because human life on Earth has an expiration date. Inevitably, life on Earth will come to an end, whether by climate disaster, cataclysmic war, or the death of the sun in a few billion years. To avoid extinction, we will have to find a new home planet, perhaps even a new solar system, to inhabit.