Ask Ethan: Can black holes really cause dark energy? | by Ethan Siegel | Starts With A Bang! | Feb, 2023

Size comparison of the two black holes imaged by the Event Horizon Telescope (EHT) Collaboration: M87*, at the heart of the galaxy Messier 87, and Sagittarius A* (Sgr A*), at the center of the Milky Way. Although Messier 87’s black hole is easier to image because of the slow time variation, the one around the center of the Milky Way is the largest as viewed from Earth. (Credit: EHT collaboration (Acknowledgment: Lia Medeiros, xkcd))

Despite all we’ve learned about the Universe over the 20th and 21st centuries, a few important phenomena have yet to be sufficiently explained. We know…

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