One of the mysteries of the English language finally explained.
1A bright region on the surface of the sun, linked to the subsequent appearance of sunspots in the same area.
- ‘Although not easily discerned in telescopic views of the Sun, these features are brilliant enough that the overall effect of the combined spots and faculae is to boost irradiance levels.’
- ‘Associated with sunspots are brighter areas called faculae.’
- ‘If the faculae loom above the surface, they could radiate light efficiently, thereby boosting the sun's overall brightness, especially during the solar maximum.’
- 1.1 A bright spot on the surface of a planet.
Early 18th century: from Latin, diminutive of fax, fac- ‘torch’.
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