The sun as a star

Physics

Scientific paper

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Scientific paper

The Sun is one of 100 billion stars within our galaxy. Our daytime star is nothing other than condensed matter in a very diluted medium (the mean density of the universe is about 2 × 10-3 g cm-1 or 10000 atoms in a volume equal to the Earth's volume). A thermodynamical equilibrium prevails within the centre of the Sun - everything is isotropic and homogeneous. For the layers just below the photosphere the temperature is about 6000 K. Then comes the Sun's outer atmosphere, composed of the chromosphere and the corona with temperatures ranging from 10 to 20 thousand degrees and 1 to 2 million degrees, respectively.

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