big-bang model, widely held theory of the evolution of the universe. Its essential feature is the emergence of the universe from a state of extremely high temperature and density —the so-called big bang that occurred 13.8 billion years ago.

The Big Bang Theory is the most accepted cosmological model explaining the origin and evolution of the universe. The theory says that all the energy and spacetime in the universe were initially contained in an infinitely dense, hot, and incredibly tiny singularity.

Big Bang The Big Bang theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution. It describes the rapid expansion of matter from a state of extremely high density and temperature.

The "Big Bang" is the term given to what is currently the most widely accepted scientific model for the origin and evolution of the Universe. This model has supplanted other models such as the Steady State theory proposed by Hoyle, Bondi and Gold in the 1940s.

The Big Bang Model in SDLC (Software Development Life Cycle) is a linear and non-sequential approach to software development, where all phases of the SDLC are executed simultaneously. In this model, the requirements gathering, design, coding, testing, and implementation stages are combined into one single step.