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The Sun






General Properties






Radius: 7 x 10⁸m
        700 thousand km, ~100 Earth Radii



Mass: 2 x 10³⁰ kg
        300,000 Earth Masses



Density: 1.4 g/cm³
    Similar to Water. Earth average is 5 times more dense
    Varies greatly with radius: 150 g/cm³ at the Sun's core!



Temperature: 5780 K (Kelvin Degrees) at Surface
    Also varies greatly with radius: 15 million K at core!





Composition (by Mass):	71%	Hydrogen
	27%	Helium
	2%	Other (C, N, O, Mg, Si, Fe, etc)







    How do we know this? We have determined it all by looking at Sun Light.





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