Any primordial black holes of low mass that may have formed would have evaporated long ago through Hawking radiation. If you plug the mass of a tennis ball into

Any primordial black holes of low mass that may have formed would have evaporated long ago through Hawking radiation. If you plug the mass of a tennis ball into the equations, it would evaporate in well under a second. (Btw, don't stand next to anything that radiates the entire mass-energy of a tennis ball in under a second. Small black holes shine really brightly)