Evidence of primordial black holes could be hiding inside Earth rocks

Evidence of primordial black holes could be hiding inside Earth rocks

Primordial black holes may be some of the strangest relics left over from the dawn of the universe. These objects are thought to have formed only fractions of a second after the Big Bang, when matter was so dense that small regions collapsed under their own gravity. Unlike black holes born from collapsing stars, primordial ones—often called PBHs—could be as small as an atom yet contain the mass of a mountain. For decades, physicists have wondere…