Over 4.6 billion years ago, the pre-solar nebula formed and began to collapse leading to the formation of the Sun. Within 50 million years, the Sun became a main-sequence star. Today, the sun remains in the main-sequence phase. The sun is not destined for a supernova, which occurs in case of massive stars, 8 to 15 times more massive than the sun. Instead, the Sun will passively eject its outer layers after the red giant phase and transform into a white dwarf.
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