Most scientists agree that the universe began in an expansion called the "Big Bang". At the start of the Big Bang, the universe had an extremely high temperature, which prevented the formation of complex structures like stars, or even very simple ones like atoms. During the Big Bang, a phenomenon called "inflation" took place, in which the universe briefly expanded ("inflated") to a much larger size. Inflation explains some characteristics of the universe that had previously greatly confused researchers. After inflation, the universe continued to expand at a slower pace. It became much colder, eventually allowing for the formation of such structures.
Most scientists agree that the universe began in an expansion called the "Big Bang". At the start of the Big Bang, the universe had an extremely high temperature, which prevented the formation of complex structures like stars, or even very simple ones like atoms. During the Big Bang, a phenomenon called "inflation" took place, in which the universe briefly expanded ("inflated") to a much larger size. Inflation explains some characteristics of the universe that had previously greatly confused researchers. After inflation, the universe continued to expand at a slower pace It became much colder, eventually allowing for the formation of such structures.