supergranulation cell

[soo-per-gran-yuh-ley-shuhn]

su·per·gran·u·la·tion cell

[soo-per-gran-yuh-ley-shuhn]
noun Astronomy.
one of a number of large convection cells in the photosphere and chromosphere of the sun, each having a diameter of 10,000–20,000 miles (16,000–32,000 km) and lasting longer than a day.
Also called su·per·gran·u·la·tion.


Origin:
1970–75; super- + granulation
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Supergranulation cell is always a great word to know.
So is eon. Does it mean:
one billion years
either of the two times a year when the sun is at its greatest distance from the celestial equator that takes place about June 21 and about December 22
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