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A comment on Black Hole Propulsion as Technosignature. Parent comment

Re:Black Hole Propulsion as Technosignature by dmitrygr on Thursday March 07, 2019 @12:30PM (#19329996)
Emit low energy photons, expend energy X, receive higher energy photos with energy Y (Y> X)

Maybe this way?

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Re:Black Hole Propulsion as Technosignature by extropy on Thursday March 07, 2019 @02:16PM (#19331172)
Yes I want my free energy device too.
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Re:Black Hole Propulsion as Technosignature by thatcherc on Thursday March 07, 2019 @02:25PM (#19331261)
This isn't a free energy device because you're extracting energy from the rotation of a black hole (this process only works on rotating black holes). After a long enough time, you could extract all of the angular momentum from the black hole using this method.
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