The concept of the universe expanding from a singularity is central to which theory?

The Big Bang Theory is crucial in explaining the origin and expansion of the universe from an extremely hot and dense state, often referred to as a singularity. This theory posits that approximately 13.8 billion years ago, the universe began to expand from this singular point, leading to the formation of matter, energy, and the cosmic structures we observe today.

The Big Bang Theory is supported by multiple lines of evidence, such as the observed redshift of galaxies, which indicates that they are moving away from us, suggesting that the universe is indeed expanding. Additionally, the cosmic microwave background radiation provides a snapshot of the early universe, further substantiating the theory.

String Theory, while a fascinating area of theoretical physics, deals primarily with the fundamental particles and forces, and does not specifically address cosmic evolution or expansion in the same manner as the Big Bang Theory. Quantum Theory focuses on the behaviors of particles at the microscopic level, and although fundamental to physics, it does not encompass the large-scale structure and evolution of the universe. Relativity Theory, notably General Relativity, provides a framework for understanding gravity in the context of spacetime but does not specifically characterize the initial event that led to the universe's expansion.

Thus, the Big Bang Theory distinctly