Dr Becky Smethurst discusses Ultra Massive Black Holes - more information and book links below ↓ ↓ ↓

A Brief History of Black Holes by Becky Smethurst (Amazon links)...
US: https://amzn.to/3u0b4BN
UK: https://amzn.to/3VxlNPV

Becky's website: https://rebeccasmethurst.co.uk
And her YouTube channel:    / drbecky  

How Big Can a Black Hole Grow? by Andrew King: https://arxiv.org/abs/1511.08502

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