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Scientific American

April 1, 2001

1 min read

Hole in the Middle

Not Too Big, Not Too Small, a New Class of Black Hole Emerges

By George Musser

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George Musser is a contributing editor at Scientific American and author of Putting Ourselves Back in the Equation (2023) and Spooky Action at a Distance (2015), both published by Farrar, Straus and Giroux. Follow him on Mastodon @gmusser@mastodon.social, Bluesky @gmusser.bsky.social and Threads @georgemusserjr@threads.net

More by George Musser

This article was originally published with the title “Hole in the Middle” in Scientific American Magazine Vol. 284 No. 4 (April 2001)

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