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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.
Learn about the Sun, the star at the heart of our solar system, and its connection and interactions with Earth. Explore the Sun's names, myths, songs, eclipses, and more with NASA resources and activities.
- 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.
Learn about the Sun, the star at the center of our solar system, its structure, features, and history. Find out how the Sun affects Earth and other planets, and how it will change in the future.
Sep 15, 2018 · Learn about the sun, the star that holds our solar system together and provides light, heat, and energy to Earth. Find out how the sun works, what it looks like, and how it will change in the future.
3 days ago · The Sun is the source of an enormous amount of energy, a portion of which provides Earth with the light and heat necessary to support life. It is part of the " observable universe ," the region of space that humans can actually or theoretically observe with the aid of technology.