Stars are primarily composed of gases, mainly hydrogen and helium. These gases undergo nuclear fusion, producing immense amounts of heat and light.

Primary Component of Stars: Gases
Stars are primarily composed of gases, with hydrogen and helium being the most abundant elements. These gases undergo nuclear fusion in the star's core, producing energy that is emitted as light and heat. Let's delve deeper into the composition of stars:

Hydrogen:
- Hydrogen is the most abundant element in stars, making up about 75% of their mass.
- In the core of a star, hydrogen atoms fuse together to form helium, releasing large amounts of energy in the process.

Helium:
- Helium is the second most abundant element in stars, constituting around 24% of their mass.
- Helium is produced through the fusion of hydrogen atoms in the star's core.

Other Gases:
- Stars also contain trace amounts of other gases, such as carbon, oxygen, and nitrogen.
- These elements play important roles in the star's life cycle and can influence its color, temperature, and luminosity.

Importance of Gases:
- Gases are crucial for the existence and function of stars, as they provide the fuel for nuclear fusion reactions.
- Without gases, stars would not be able to generate the energy needed to sustain themselves and emit light and heat.
In conclusion, gases, particularly hydrogen and helium, are the primary components of stars. Their interactions and fusion reactions within the stellar core are responsible for the immense energy output that sustains stars and allows them to shine brightly in the night sky.