91Ó°ÊÓ

Hydrogen is the most abundant element in the Sun, and it's the key player in solar composition.

• It makes up about 74% of the Sun's mass.
• Hydrogen atoms are constantly undergoing nuclear fusion in the Sun's core.

During nuclear fusion, hydrogen nuclei combine to form helium, releasing a tremendous amount of energy in the process. This energy is what powers the Sun and provides light and heat to our solar system. The transformation of hydrogen into helium is what keeps the Sun glowing. Without this process, the Sun would not be able to maintain its energy output. Hydrogen's abundance and capability to fuel nuclear fusion underline its prominence in the solar composition.

Helium is the second most abundant element in the Sun after hydrogen. It accounts for nearly 24% of the Sun’s mass. This element is integral to the nuclear fusion process that occurs in the Sun’s core. Helium is produced when hydrogen nuclei fuse. The fusion process releases energy, which radiates outward, forming the luminous sphere we see from Earth.
In itself, helium is a stable and inert gas, known for not reacting with other elements under normal conditions. Despite its lack of chemical reactivity, helium plays a crucial role in the solar energy-generating cycle. Without the presence of helium, the energy production in the Sun would halt, and it would have dire effects on all the planets orbiting it, including Earth.

When examining the elements present in the Sun, hydrogen and helium stand out as the most abundant. These two light elements make up nearly the whole composition of the Sun—comprising roughly 98% of its mass.

• Hydrogen constitutes around 74% of the Sun's mass.
• Helium accounts for about 24% of the Sun’s mass.

This overwhelming abundance of hydrogen and helium defines the solar atmosphere and influences its behavior. While there are trace amounts of heavier elements such as oxygen, carbon, and neon, they play a minimal role in the Sun's structure. Understanding these abundantly present elements helps us delve into solar physics and comprehend the dynamics of our closest star. This knowledge also provides insight into the processes driving the Sun’s lifecycle and the way it fuels our solar system's energy needs.
The predominance of hydrogen and helium underscores their critical importance to the Sun's composition and functionality.