Original sentence: Classic black holes create a problem for physics known as the black hole information paradox wherein all the quantum nature (information) of the matter and energy that had ever fallen into a classic black hole is thought to entirely vanish from existence into the zero-volume singularity at its heart.This theorized outcome violates the quantum mechanical law of reversibility, which essentially holds that quantum information must not be lost in any process
Edited sentence: Bekenstein noted that this theorized outcome violated the quantum mechanical law of reversibility, which essentially holds that quantum information must not be lost in any process.Classic black holes create a problem for physics known as the black hole information paradox, an issue first raised in 1972 by Jacob Bekenstein and later popularized by Stephen Hawking.The information paradox is borne out of the realization that all the quantum nature (information) of the matter and energy that falls into a classic black hole is thought to entirely vanish from existence into the zero-volume singularity at its heart