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Event Horizon Telescope reconstruction of the black hole at the centre of M87
Cosmology · Black Holes · Theoretical Physics

What If Every Black Hole Contains a Universe?

In 1972, the Indian-American physicist Raj Kumar Pathria published a one-page paper in Nature with a single audacious suggestion: the observable universe and a black hole may, mathematically, be the same kind of object. Half a century later, the idea has matured into a serious branch of theoretical cosmology.

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