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These are some keyword suggestions for the term "Sun".
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The Sun is a G-type main-sequence star (G2V) based on its spectral class , and is informally referred to as a yellow dwarf. It formed approximately 4.6 billion [a]   years ago from the gravitational collapse of matter within a region of a large molecular cloud . Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System . 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 .