The very concept of black holes seems improbable. Albert Einstein infamously refused to believe they could exist, even though his theory of general theory of relativity was instrumental in predicting them.  Now, scientists have witnessed something about these baffling cosmic monstrosities that further stretches the boundaries of physics: a titanic collision of two already enormous black holes, which merged to form a singularity so extreme that it has scientists wondering if what they're witnessing is even possible. As detailed in a new pre-print paper, the black hole, designated GW231123, boasts an astonishing mass about 225 times the mass of the […]