Sun

                               Sun

The Sun is the star at the center of the Solar System. It is nearly perfect sphere of hot plasma, with internal convective motion that generates a magnatic field via a dynamo process. It is by far the most important source of energy for life on the Earth. Its diameter is about 1.39 million kilometres ( 864,000 miles ), or 109 times  that of Earth and it's mass  about 330000 times tht of Earth . It accounts for about 99.86% of the total mass of the Solar System.  The Sun mass consists of hydrogen  ( 73%) the rest is mostly helium ( 25% ) , with much smaller quantities of heavier elements including oxygen, carbon, neon, and iron.

The Sun is a G type main sequence star ( G2V ) based on its spectral class. As such, it is informally  and not completely accurately referred to as a yellow dwarf. It formed  approximately 4.6 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud . The central mass  become so hot  and dense that  it eventually initiated nuclear fusion on its Core. The sun currently fuses about 600 million ton of hydrogen into Helium every second converting 4 million tons  of matter into energy every second as a result. This energy which can take between 10000 and 170000 years to escape from its Core is the source of the Sun light and heat . Sun is also called hot ball of fire.

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