The sun
The sun forms a very important part of the solar system. It accounts for 98% of the total mass of the solar system. The sun is not solid like the earth. Instead, it is composed of plasma. As a result, the sun rotates faster at its equator than at its poles. It takes about 25 days to complete one rotation at the equator and 33 days to complete one rotation at the poles. The major elements that constitute the sun are hydrogen and helium. It is also composed of other elements like iron, nickel, oxygen, etc.
The visible surface of the sun is called the photosphere. It heats up to a temperature of about 6000 Kelvin. The core of the sun, bowever, has a temperature exceeding 13 million Kelvin. The sun also has a strong magnetic field has as responsible for effects such as sun sports, solar flares, etc
The sun is a life-force for earth. The light from the Sun is essential for all living things. It aids in the process of photosynthesis for plants. It also helps in the production of vitamin D. However, excessive exposure to sunlight can create serious damage in the form of sunburn, cancer, etc.
The Sun has also been an important cultural symbol throughout history. The ancient Egyptian God Ra, for example, was considered the Sun.