It's easier to destroy than to create spacecraft. How much does this cripple possible alien invasions?
@drethelin Consider the astronomical expense in interstellar travel. What's the point invading?
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@St_Rev In theory you run out of resources in your star system so it can be profitable to use some of those resources to add extra systems -
@drethelin Take all your waste, make a planet out of it, heat melts everything down to slag, let it cool, mine for resources.
End of conversation
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.