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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 wongarsu on Friday August 13, 2021 @10:19AM (#28169160)
A Dyson sphere around a body with 4.5cm radius sounds quite manageable. I wonder how small a Dyson sphere could be with current materials. I imagine it's mostly limited by gravitational forces at that point?
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