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Old 10-07-2020, 05:19 PM
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Atmos (Colin)
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Atmos is offline
Join Date: Aug 2011
Location: Melbourne
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Originally Posted by glend View Post
I always believed you needed a certain mass to develop a black hole. A grapefruit sized black hole? Sounds impossible.
There is a theory that there are primordial black holes scattered throughout the cosmos. Usually these micro black holes are typically expected to be much much much smaller and have been used as a way of defining dark matter; although not a widely accepted hypothesis.

Planetary mass black holes could theoretically have been “normal” garden variety ones back 13 billion years ago and reduced in size due to Hawking radiation over the eons.
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