Our Star-The Sun

  • Exhibition Text

    • Our Sun is an ordinary star, just one among hundreds of billions of stars in the Milky Way Galaxy. As the only star we can observe in detail, it provides a basis for our understanding of all stars. The Sun is composed almost entirely of hydrogen and helium gas. Multimillion-degree temperatures in its dense core sustain nuclear fusion, providing the energy source for sunlight. The surface of the Sun is marked by colossal magnetic storms. The Sun’s gravity holds in orbit a family of planets, moons, asteroids, and comets - the solar system.

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  • For Educators

    • Topic: Astronomy

      Subtopic: The Sun

      Keywords: Astrophysics, Sun, Solar system, Hydrogen, Nuclear fusion, Helium

      Audience: General

In This Section

Sun: 3D Cutaway Model

Sun: 3D Cutaway Model

The Sun’s visible surface, called the photosphere, radiates at about 5,500 degrees Celsius.