The Second Law of Thermodynamics dictates that entropy (disorder) in a closed system must always increase. If the universe loops from an “End” back to a “Start,” it faces the Entropy Paradox: a high-entropy, disordered Heat Death would seemingly have to “become” a low-entropy, highly ordered Big Bang. Without a mechanism to erase this information, the loop would “clog” with accumulated disorder, making a functioning cycle physically impossible.