Looking skyward on a clear night, we see sparkling stars that remind us that a huge cosmos waits for exploration. The urge to explore space has been rekindled of late. Now, pioneers want not only to visit other planets—such as Mars or the moon—but to build colonies there. This raises thorny questions about ethics. Is colonizing space, a potential obligation for our species’ long-term survival, something we ought to do? If so, does it show human …
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