A giant black hole keeps evading detection and scientists can't explain it
An enormous black hole keeps slipping through astronomers' nets. Supermassive black holes are thought to lurk at the hearts of most, if not all, galaxies. Our own Milky Way has one as massive as 4 million suns, for example, and M87's — the only black hole ever imaged directly — tips the scales at a whopping 2.4 billion solar masses.
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