What if the moon turned into a black hole?

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Get a copy of What If? 2 and Randall’s other books at: https://xkcd.com/books
More serious answers to absurd questions at: https://what-if.xkcd.com/

This question comes from Matt, who asks: what would happen if the Moon were replaced with an equivalently-massed black hole? And what would a lunar ("holar"?) eclipse look like?

Credits
*******
Randall Munroe | Narrator
Henry Reich | Writer & Director
Lizah van der Aart | Illustration and Video Editing
Ever Salazar | Chief Chaos Controller
Know Art Studios | Music & Sound Effects

What If? The Video Series is the official adaptation of the What If? books by Randall Munroe and is produced by Neptune Studios LLC.

Randall Munroe is the author of the New York Times bestsellers What If? 2, How To, What If?, and Thing Explainer; the science question-and-answer blog What If?; and the popular web comic xkcd (https://xkcd.com). A former NASA roboticist, he left the agency in 2006 to draw comics on the internet full time.

Henry Reich is the creator of MinutePhysics and executive producer of MinuteEarth and MinuteFood and founder of Neptune Studios LLC (the parent company for all three youtube channels).

©2025 xkcd, inc.

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