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$\begingroup$ "the only real constraint is that even if it does not collide with the Earth, its passage will end life" Does that mean it's moving fairly slowly? $\endgroup$– PM 2RingCommented Oct 17, 2018 at 5:59
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1$\begingroup$ What is a "sharp angle"? $\endgroup$– ProfRobCommented Oct 17, 2018 at 6:02
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$\begingroup$ Very closely related astronomy.stackexchange.com/questions/24810/… $\endgroup$– ProfRobCommented Oct 17, 2018 at 6:04
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2$\begingroup$ Related: astronomy.stackexchange.com/questions/18924/… and worldbuilding.stackexchange.com/questions/51612/…. And note that there are many questions about rogue planets on Wordlbuilding.SE that you could benefit from. $\endgroup$– user1569Commented Oct 17, 2018 at 8:46
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2$\begingroup$ I'm voting to close this question as off-topic because it falls within the scope of "Questions that are purely hypothetical". $\endgroup$– Chappo Hasn't ForgottenCommented Oct 17, 2018 at 21:35
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