The Sun:
* Hydrogen (H): About 70.6% by mass, the primary fuel source for nuclear fusion in the Sun's core.
* Helium (He): About 27.4% by mass, the product of hydrogen fusion.
* Other elements (metals): About 2% by mass, including elements like oxygen, carbon, neon, iron, and others.
Other Stars:
* Hydrogen and Helium: These two elements are the most abundant in most stars, though the exact percentage varies.
* Metals: The amount of heavier elements varies depending on the star's age and origin. Younger stars tend to have fewer metals than older stars. "Metals" in astronomy refer to any element heavier than helium.
Key Differences:
* Age: Older stars have more helium and heavier elements than younger stars because of nuclear fusion.
* Mass: More massive stars burn through their fuel faster and have a shorter lifespan. They also have higher core temperatures and pressures, leading to the production of heavier elements.
* Location: Stars forming in different regions of the galaxy may have slightly different compositions due to variations in the interstellar gas and dust clouds from which they formed.
In essence, the Sun and other stars are similar in composition, primarily hydrogen and helium. The main difference lies in the relative abundances of these elements, which are influenced by the star's age, mass, and the environment where it formed.
