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System. Chemically, about three quarters of the Su'n'sm!ass , •'[ jjhydrogen, while the rest is mostlyrheŁrartpfne remaindeii

the star at the center of the Solar Systpm. It is a Imost --herical and consists of hot plasma interwoven with Ids. It has a diameter of about 1,392,684 km, abóut 109 if Earth, and its mass (about 2x1030 kilograms, 330,000 Earth) accounts for about 99.86% of the total mass of

nonetheless equals 5,628 timels tffS*Fnass of Earth) vier elements, includlńg oxygen, carbon, neon and

' .ii

i others

years ago from the gravitational 11 molecular cloud.,Most of the while the rest flattened into an coma the Solar System. The central mass inse, eventually initiating

is thought that almost aII other stellar classification, based on nce star (G2V), and is

because its visible radiation ;he spectrum and the Earth it may

of blue light. In the

i of