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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 triclops200 on Friday August 13, 2021 @09:25AM (#28168535)
That is the event horizon: when discussing a black hole's "size", you're discussing the event horizon.
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