Cyclic Universe

A cosmological model proposing that the cosmos undergoes an endless sequence of cycles, each beginning with a "Big Bang" and ending with a "Big Crunch" or a transformative "Big Bounce." In this view, the universe has no true beginning or end, but is an eternal, repeating loop of expansion, contraction, and rebirth. Key motivations for this theory include resolving the initial singularity problem of the standard Big Bang and providing a potential explanation for the universe's observed low entropy. Modern versions, often inspired by string theory and braneworld cosmologies, suggest collisions between higher-dimensional "branes" could trigger each new cycle. While speculative and lacking definitive evidence, it offers a profound alternative to a single, linear timeline, presenting a cosmos of eternal return and renewal.