What Is The Sun Made Of?
QUICK ANSWER
The Sun is made of about 74 percent hydrogen and 24 percent helium by mass, with trace amounts of heavier elements (oxygen, carbon, neon, iron, and others). The Sun is essentially a giant ball of plasma, the fourth state of matter, with hydrogen-helium fusion happening continuously at its core.
The Sun is made almost entirely of hydrogen and helium, the two lightest elements in the universe. It's not burning in the sense of fire (which requires oxygen). Instead, the Sun produces energy through nuclear fusion at its core, the same process that powers all stars. The result is a glowing ball of plasma that has shone steadily for 4.5 billion years.
What is the Sun's composition?
Mostly hydrogen and helium. According to NASA, the Sun is about 74 percent hydrogen and 24 percent helium by mass, with the remaining 2 percent made of heavier elements including oxygen, carbon, neon, iron, and trace amounts of many others. The composition is roughly the same as the universe overall, since the Sun formed from material that was already enriched with elements created in earlier generations of stars. The heavier elements are responsible for many of the Sun's spectral features.
Is the Sun on fire?
No, not in the everyday sense. Fire requires oxygen, and the Sun has very little free oxygen available for combustion. Instead, the Sun produces energy through nuclear fusion in its core, where hydrogen atoms fuse together to form helium under enormous pressure and temperature. The fusion releases energy, which gradually works its way to the surface and radiates out into space as light and heat. The Sun's glow is the result of plasma at thousands of degrees, not chemical combustion.
What is plasma?
The fourth state of matter, after solid, liquid, and gas. Plasma is what happens when a gas gets hot enough that its atoms lose their electrons, leaving a soup of ions and free electrons. The Sun's intense heat (10,000°F at the surface, millions of degrees deeper down) keeps virtually all of its material in plasma state. The plasma is electrically conductive, which is why the Sun has powerful magnetic fields and produces phenomena like sunspots, solar flares, and the solar wind. Plasma is actually the most common state of matter in the universe.
How does the Sun make energy?
Through nuclear fusion. In the Sun's core, the temperature is about 27 million°F and the pressure is about 250 billion times Earth's atmosphere. Under these extreme conditions, hydrogen atoms fuse together to form helium, releasing energy in the process. The Sun fuses about 600 million tons of hydrogen into helium every second. About 4 million tons of mass is converted directly into energy each second, following Einstein's equation E=mc². The energy produced in the core takes hundreds of thousands of years to make its way to the surface.
The Sun is about 74 percent hydrogen and 24 percent helium, with trace heavier elements. It's a ball of plasma, not a burning ball of gas; the energy comes from nuclear fusion at the core, not combustion. The Sun fuses 600 million tons of hydrogen every second, converting some of that mass directly into energy. The fusion will continue for about another 5 billion years before the Sun runs low on core hydrogen.
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