Vega is a main-sequence star, meaning it is currently fusing hydrogen into helium in its core. Here's a breakdown of its composition:

By Mass:

* Hydrogen: ~ 90%

* Helium: ~ 9%

* Other Elements (Metals): ~ 1%

Key Metals:

* Carbon: ~ 0.3%

* Oxygen: ~ 0.1%

* Nitrogen: ~ 0.1%

* Silicon: ~ 0.01%

Important Notes:

* Metals in Astronomy: In astronomy, the term "metal" refers to any element heavier than helium.

* Relative Abundance: The exact composition of Vega might slightly vary in different parts of the star. The percentages above are approximate averages.

* Stellar Evolution: As Vega continues to evolve, the proportions of these elements will gradually change.

Interesting Fact: Vega is known for its relatively high abundance of metals, which is considered unusual for a star of its age and type.