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The Sun is the star at the center of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies.
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Learn about the Sun, the star at the heart of our solar system, and its influence on Earth and beyond. Explore its history, science, culture and upcoming missions with NASA.
The Sun is the largest object in our solar system. Its diameter is about 865,000 miles (1.4 million kilometers). Its gravity holds the solar system together, keeping everything from the biggest planets to the smallest bits of debris in orbit around it.
- Composition. The sun is made up of a blazing combination of gases. These gases are actually in the form of plasma. Plasma is a state of matter similar to gas, but with most of the particles ionized.
- Electromagnetic Radiation. The sun’s energy travels to Earth at the speed of light in the form of electromagnetic radiation (EMR). The electromagnetic spectrumexists as waves of different frequencies and wavelengths.
- Evolution of the Sun. The sun, although it has sustained all life on our planet, will not shine forever. The sun has already existed for about 4.5 billion years.
- Sun’s Structure. The sun is made up of six layers: core, radiative zone, convective zone, photosphere, chromosphere, and corona. Core. The sun’s core, more than a thousand times the size of Earth and more than 10 times denserthan lead, is a huge furnace.
Sep 24, 2024 · Learn about the Sun, the star around which Earth and the other planets revolve, and the source of energy for life on Earth. Explore its physical properties, structure, evolution, and role in the solar system and the universe.
Jan 22, 2013 · Learn about the sun's interior, atmosphere, and solar wind, and how they produce visible light and magnetic fields. Explore the sun's zones, layers, and phenomena, such as sunspots, flares, and coronal mass ejections.
