The Sun

The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma with internal convective motion that generates a magnetic field via a dynamo process it is by far the most important source of energy for life on Earth. Its diameter is about 1.39 million kilometres , i.e. 109 times that of Earth, and its mass is about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System. About 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.

The Sun is a G-type main-sequence star (G2V) based on its spectral class. As such, it is informally 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. 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.

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2 comments on The Sun

  • Matt's Mom says:

    I love the sun, so any information about the sun is interesting to me for sure. I cannot believe that its mass is 99.86% of the total mass of the Solar System. I would have never guessed that at all. I know it is big, but not that big. Do you know if the sun is diminishing at all to where hundreds of years from now there will be no sun? Or maybe the nuclear fusion happening it its core keeps it rebuilding and keeps it from being destroyed?

    • admin says:

      i cant say for sure, but I do remember reading something about the sun running out of fuel in about 5 million years, and due to its size our sun will simply go dark, unlike larger stars that will go supernova when they die, but even so when our sun dies it will still destroy our solar system

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