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SUN

The Earth and other planets and objects in our solar system orbit the Sun, which is the star at the center of the system. The Sun is a nearly perfect sphere of hot plasma and it is the biggest body of our planetary system, constituting over 99 percent of its total mass.

The Sun image

It has a diameter about 109 times that of Earth, mass about 330,000 times that of Earth, and can fit 1.3 million Earth sized planets inside.

The Sun produces enormous amount of energy, a part of which reaches Earth and provides the light and heat required to support life, and it is the most important source of energy for our planet.

About three quarters of the Sun's mass is hydrogen, about one quarter is helium, with trace quantities of heavier elements. The Sun is a type of star informally referred to as a yellow dwarf. It is thought to be about 4.6 billion years old which is roughly middle-aged.

The great effect of the Sun on Earth has always been recognized by people and it has been thought of as a god by some cultures.

Its mean distance from our planet is 1.496 108 km or 8 min 19 s at light speed.

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