Black Holes is written by Brian Cox, a professor at the University of Manchester in England, and is fundamentally an introduction to relativity by using the extreme case of a Black Hole to motivate the exploration of relativity.
The tone of the book is conversational, but do not let the first few chapters mislead you --- the authors do not shy away from equations. The book introduced me to Penrose diagrams, which I've never seen in any other relativity-explainer book before, and uses those diagrams to explain time dialation, the split between what you can get information from and who you can send information to, and how space-time and black holes work.
The authors even get into the various nuances of differing types of black holes --- spinning ones versus stationary ones, ones that are pure singularity versus the types that were created from stars collapsing. There's an entire chapter on Hawking radiation and how that leads to black hole evaporation, as well as how the conservation of information is or is not preserved by black hole evaporation and Hawking radiation.
There's even an exploration of how wormholes and black holes are related, and how that ties into Penrose diagrams which are used to also explain how the wormhole actually separates two parts of the universe, or two universes.
I think a diligent student (I do not claim to be one!) who carefully works through the diagrams and equations in this book can actually come away with a great understanding of Penrose diagrams and space-time warping and dialation. I was impressed enough by the authors' pedagogic approach to want to read more books by Brian Cox.
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