The sun

First, the Sun is a huge star. With a diameter of 1.4 million kilometers, it could host 109 planets on its surface. It is filled with hot gases that represent more than 99.8 percent of the total mass of the solar system.  The temperature reaches 5500 degrees Celsius at the surface and more than 15.5 million degrees Celsius in the core. The great amount of mass that the Sun possesses exerts its gravitational influence on all the elements of the solar system. The sun allows the regulation of temperature at the biological level of animals, plants and, of course, human beings. 

Principal functions:

• Length of the year
• Seasons
• Length of day and night
• Tides
• Life on Earth

Elements of the sun:

• Core
• Radioactive zone
• Convection zone
• Photosphere
• Chromosphere
• Corona