After three minutes, the universe settled down and would be settled down for more than a quarter of a million years. The next thing to occur produced great evidence, visible even today. Galaxies were born from warm gas clouds, then violent outbursts occurred inside them, and once it settled down, suns, planets, stars, and everything else contained in a universe was created, or was given the opportunity to be created. The universe, however, began to grow at a high speed, a hundred trillion trillion trillion trillion times, and dropped from scorching to zero degrees. Inflation still continues to this day but at a slower speed.
Inflation is what made our universe so smooth and big in general.
However, in the end, matter prevailed. Research on the present and past has helped the Big Bang to be scientifically accepted. In recent years many things have happened to help prove or lend support to the Big Bang. Heisenberg's uncertainty principle revealed the concept of Quantum Mechanics. This states all physical quantities are subject to unpredictable and uncaused changes.