Big Bang Theory.

 

The Big Bang theory is the prevailing scientific explanation for the origin of the universe. It suggests that about 13.8 billion years ago, the universe began as an extremely hot, dense, and small singularity. Then, it rapidly expanded and continues to expand, resulting in the vast cosmos we observe today. During the early stages, fundamental forces and particles formed, leading to the creation of matter and energy. As the universe expanded and cooled, matter eventually clumped together, forming galaxies, stars, and planets. The Big Bang theory is supported by various observations, such as cosmic microwave background radiation and the redshift of galaxies.