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Sun

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

Sun The central star (G spectral type) in the solar system, 696 000 km in diameter, 333 000 × Earth mass, 1 300 000 × Earth volume, and with a mean density of 1410 kg/m3. The equator is inclined at 7.25° to the plane of the ecliptic. It is principally composed of hydrogen and helium. The visible surface is the ‘photosphere’ (temperature 6000K). The Si-normalized solar abundances for the terrestrially non-gaseous elements match those of the C1 carbonaceous chondrites.

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AILSA ALLABY and MICHAEL ALLABY. "Sun." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 23 Nov. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Sun." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (November 23, 2009). http://www.encyclopedia.com/doc/1O13-Sun.html

AILSA ALLABY and MICHAEL ALLABY. "Sun." A Dictionary of Earth Sciences. 1999. Retrieved November 23, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Sun.html

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