Original sentence: Fuzzball theory replaces the singularity at the heart of a black hole by positing that the entire region within the black hole’s[event horizon is actually a ball of strings, which are advanced as the ultimate building blocks of matter and energy
Edited sentence: Fuzzball theory replaces the singularity at the heart of a black hole by positing that the entire region within the black hole’s event horizon is actually a ball of strings, which are advanced as the ultimate building blocks of matter and energy