What make Sun shine and produce heat?

The sun has three main parts: the core, the radiative zone surrounding the core, and the convective zone around that. The core of the sun makes up the inner 25 percent. The radiative zone makes up 45 percent of the sun’s radius, and the convective zone makes up 30 percent of it.

The gravity of the sun pulls its mass inward, creating a lot of pressure. This pressure forces atoms of hydrogen to fuse together in nuclear reactions, like nuclear bombs that people build. The energy gives off different kinds of light, like infrared light, ultraviolet light and visible light. Microwaves, radio waves and X-rays also come from the sun. The sun also gives off energized particles that make up solar wind. The energy from solar wind warms the Earth and influences the weather. Thanks to the Earth’s atmosphere, most of the sun’s radiation and solar winds doesn’t harm us

HOW SUN WORKS? .

source:

• http://discoverykids.com/articles/how-does-the-sun-provide-heat-and-light/
• http://www.space.com/14735-sun-heat-source-explained.html