Here's a breakdown:
* Hydrogen: The vast majority of the Sun's composition is hydrogen, accounting for about 70.6% of its mass. The Big Bang theory suggests that the early universe was extremely hot and dense, filled with an abundance of protons (hydrogen nuclei) and electrons. As the universe expanded and cooled, these particles eventually combined to form hydrogen atoms.
* Helium: The Sun contains about 27.4% helium by mass. While some helium was also produced during the Big Bang, the majority of the Sun's helium formed through nuclear fusion in its core. This fusion process involves hydrogen atoms being converted into helium, releasing immense amounts of energy.
In short, the Sun was formed from a cloud of gas and dust that already contained hydrogen and a smaller proportion of helium from the Big Bang. This initial composition was crucial for the Sun's formation and its continued energy production through nuclear fusion.
