User talk:Elshazly2008

The Sun The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma,[15][16] with internal convective motion that generates a magnetic field via a dynamo process.[17] It is by far the most important source of energy for life on Earth It accounts for about 99.86% of the total mass of the Solar System.[18] Roughly three quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron.[19] 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 (its light is closer to white than yellow). It formed approximately 4.6 billion[a][11][20] years ago from the gravitational collapse of matter within a region of a large .Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the . The central mass became so hot and dense that it eventually initiated nuclear fusion in its core. It is thought that almost all stars form by this process. Cite: https://en.wikipedia.org/wiki/Sun