Errant Shot

To think that there are no other sentient beings in the universe borders on vanity.
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To think that other sentient beings would be any less prone to violence and war than humans borders on naivety.
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Collateral damage is a reality with any conflict.
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What if there is undelivered ordinance... stray bullets... from distant, cosmic conflicts floating through space like wandering asteroids or long-period comets?
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What if bystander Earth was the victim of one of these... errant shots?