Listen to a Podcast About Black Holes

Dive into the most extreme objects in the universe. Understand how black holes form, what happens at the event horizon, Hawking radiation, and what black holes reveal about the nature of spacetime.

In April 2019, the Event Horizon Telescope (EHT) collaboration released the first-ever direct image of a black hole — the supermassive black hole M87* located 55 million light-years away, with a mass 6.5 billion times that of our Sun. Closer to home, Sagittarius A* sits at the center of the Milky Way with a mass of about 4 million solar masses; the EHT captured its image in 2022, confirming decades of indirect evidence. The boundary of a black hole, defined by the Schwarzschild radius (calculated as 2GM/c²), marks the point of no return where escape velocity exceeds the speed of light — for a black hole with the mass of Earth, this radius would be just 8.9 millimeters, illustrating the extraordinary density required to warp spacetime so completely.

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