Category Archives: General Relativity

Lenny Susskind’s Humour

Posted on November 9, 2024 by Sung Lee

I stumbled upon one of Lenny Susskind’s old arXiv papers titled “Rebuttal to a Paper on Wormholes“. In the abstract, he wrote a pretty harsh criticism on another arXiv paper by saying “the author of that paper demonstrated that he … Continue reading →

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Can a toroidal black hole exist?

Posted on April 13, 2024 by Sung Lee

Many years ago, a brilliant Berkeley mathematician Richard Borcherds started a blog on math. I have no doubt he has so many interesting things to share about math. Regrettably though, for whatever reason, it didn’t last long. In one of … Continue reading →

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The First Image of a Supermassive Black Hole at the Heart of Milky Way Galaxy

Posted on May 16, 2022 by Sung Lee

The first image of a supermassive black hole was obtained back in 2019 by the Event Horizon Telescope (ETH) Collaboration. The supermassive black hole, called M87*, is located at the center of  a distant galaxy Messier 87. It is about … Continue reading →

Posted in Astronomy, Astrophysics, General Relativity | Leave a comment