I'm with Malcom... still theoretical objects...tho great fun to read about...
They can be used/invented to explain the energy needed to power up a quasar that we can see 2B to 10B light years away... (assuming that one believes redshift = velocity)..... i'm leaning to codswallop on that one too
enjoy the readings and the rabbit holes... There are some other cool theories and models of black holes including gravitational shielding of matter... lots of theories out there.
IIS should really have a book section... Does it? maybe i haven't found it yet.
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