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They are the Corona, the Visible Surface, the Solar and the Chromosphere. The sun is a huge hot ball of gases which are mostly hydrogen and helium. It has an innermost part, the core, in which light and heat energy are produced. The temperature in the core is about 15 million debgrees Celsius. The energy produced in the core travels to the surface in two ways. First, it travels in the form of radiant energy through the radiation zone. This zone has a temperature of 2.5 million degrees Celsius. From this zone. the energy travels by convection through the convection zone. Here, the gases undergo violent motions and carry most of the sun's energy to the surface of the sun. The photosphere, which is over 500 kilometers thick, is the apparent yellow surface of the sun. However, the sun is purely gaseous, so the photosphere is just the visible area of the sun's atmosphere. The temperature here is about 5500 degrees Celsius. Light is given off from the photosphere. The photosphere contains millions of granules. These are small patches of gases that look bright. A granule lasts for only a few minutes and then fades away. Other graanules take the places of those which have faded. The combined motion of all the granules makes the photosphere appear to be boiling. Extending about ten thousand kilometers from the photosphere is the chromosphere.

The chromosphere looks red because of glowing hydrogen gas. The top of the chromosphere contains spicules. These spicules are gas columns believed to be continuations of the violent motions of granules in the photosphere. Spicules can shoot about 16 000 kilometers into the corona. The outermost portion of the sun's atmosphere is the corona. It is estimated to have a height of more than a million kilometers. The corona is visible only when there is a total eclipse of the sun. When the sun's disk is darkened by the moon's shadow, the corona is seen as a faint light. At the corona's temperature of 1 million degrees Celsius, the particles of gas begin to escape the sun's gravity and flow outward into space. This flow of gas particles is called the solar wind. At a speed of 500 km/s, the solar wind takes a few days to reach Earth. Radiation, on the other hand, travels from the photosphere at the speed of light (3.0 x 10 to the fifth power km/s) and reaches Earth in eight minutes. The words with BOLD are the sun's parts namely: * core * photosphere * chromosphere * corona

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