Stars are primarily made up of hydrogen and helium, with trace amounts of other elements.

Here's a breakdown:

* Hydrogen (H): Makes up about 70% of a star's mass. It's the fuel that powers nuclear fusion, the process that makes stars shine.

* Helium (He): Accounts for about 28% of a star's mass. It's the primary product of hydrogen fusion.

* Other elements (less than 2%): These include elements like oxygen, carbon, neon, iron, and others. Their abundance varies depending on the star's age, mass, and evolution.

It's important to remember that stars are not solid objects; they are massive balls of hot, ionized gas (plasma). The intense gravity of these stars compresses the gases, creating the extreme temperatures and pressures necessary for nuclear fusion to occur.