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A comment on What if Planet 9 is a Primordial Black Hole? (2019). Parent comment

Re:What if Planet 9 is a Primordial Black Hole? (2019) by lovemenot on Friday August 13, 2021 @06:51PM (#28175790)
Halo Drive: Fire a laser around the Halo and get more energy reflected back than you put in.

https://www.youtube.com/watch?v=rFqL9CkNxXw&t=2s

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