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> we probably don't have to worry about anything further than 20 light years away.

On what basis? Are you assuming that malevolent extraterrestrials would be unwilling or unable to travel further than this? Why?



Kurzgesagt – In a Nutshell posted two videos studying the possible ways a malevolent society can cause problems without even leaving their star system at all.

The Dark Forest solution to the Fermi Paradox (the first strike advantage): https://www.youtube.com/watch?v=xAUJYP8tnRE

How to Win an Interstellar War (without leaving home) https://www.youtube.com/watch?v=tybKnGZRwcU




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