Primordial black holes have been theorized for decades and could even be ever-elusive dark matter. Still, no primordial black hole has ever been observed. According to a duo of astrophysicists from the University at Buffalo, Case Western Reserve University and National Dong Hwa University, these small black holes could be captured by rocky planets or asteroids, consume their liquid cores from inside and leave hollow structures; alternatively, they can leave micro-tunnels here on Earth in very old rocks, or even glass or other solid structures in very old buildings.
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