Formation of Stars
The First Stars
In this section, we will learn how the first stars were formed out of the primordial hydrogen and helium gas that existed in the early universe. We will learn how as the universe expanded and cooled, small density fluctuations in the gas caused it to collapse under its own gravity. This collapse led to the formation of dense regions called “protostars.” As the protostars continued to collapse, their cores became hot enough for nuclear fusion to begin, at which point they officially became stars.