Sun, a comparatively small star which nevertheless contains 99.9 percent of the mass of the solar system and dominates it gravitationally. In addition, because of its large mass, the interior of the Sun achieves the density necessary to sustain nuclear fusion, releasing enormous amounts of energy, some of which is radiated into space in the form of electromagnetic radiation. Most radiation is visible light. The sun also emits a flow of charged particles called the solar wind. The solar wind interacts strongly with planets that have magnetospheres, and pushes dust and gas out of the solar system. The remaining small amount of mass outside the Sun includes the nine planets (Mercury, Venus, Earth, Mars,
Sun, a comparatively small star which nevertheless contains 99.86 percent of the mass of the solar system and dominates it gravitationally. In addition, because of its large mass, the interior of the Sun achieves the density necessary to sustain nuclear fusion, releasing enormous amounts of energy, some of which is radiated into space in the form of electromagnetic radiation. Most radiation is visible light. The sun also emits a flow of charged particles called the solar wind. The solar wind interacts strongly with planets that have magnetospheres, and pushes dust and gas out of the solar system. The remaining small amount of mass outside the Sun includes the nine planets (Mercury, Venus, Earth, Mars,
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moons and [ring system]?s. In addition, there are asteroids,
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