Sun
Sun
The Sun (/sʌn/; from Old English sunne, cognate with Old High German sunna) 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.
Etymology
The term "Sun" is derived from the Old English sunne. The English proper noun 'Sun' developed from Old English sunne and may be related to south. Cognates to English sun appear in other Germanic languages, including Old Frisian sunne, sune, Old Saxon and Old High German sunna, Middle Dutch sonne, modern Dutch zon, Old Norse sunnǫ.
Related Terms
- Solar System: The gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly.
- Star: A luminous sphere of plasma held together by its own gravity.
- Plasma (physics): One of the four fundamental states of matter, and was first described by chemist Irving Langmuir in the 1920s.
- Magnetic Field: A vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.
- Dynamo Theory: A theory that explains the origin of the Earth's main magnetic field in terms of a self-exciting (or self-sustaining) dynamo.
External links
- Medical encyclopedia article on Sun
- Wikipedia's article - Sun
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