There isn't actually oxygen in the sense that we think of it in stars. Stars are primarily composed of hydrogen and helium, with trace amounts of other elements like carbon, nitrogen, and oxygen.

Here's why:

* Stars are giant fusion reactors: Stars produce energy by fusing hydrogen into helium. This process releases a tremendous amount of energy, making them shine.

* Oxygen is a product of fusion: Oxygen is formed later in the life cycle of a star, through the fusion of carbon and helium. This happens in the core of massive stars, which are much larger than our sun.

* Oxygen is not a primary fuel: While oxygen exists in stars, it's not a primary fuel source like hydrogen. Oxygen is primarily a product of nuclear fusion, not a reactant.

So, while there is oxygen present in stars, it's not a significant component compared to hydrogen and helium. It's also important to note that the oxygen we breathe on Earth is actually formed within stars and released into the universe through supernova explosions.