fac·u·la 
(făkyə-lə)
(făkyə-lə)n. pl. fac·u·lae (-lē′)
Any of various large bright spots or veined patches on the surface of a planet or other solar system body, or on the sun's photosphere.
[Latin, small torch, diminutive of fax, fac-, torch.]
faculaMemphis Facula (bottom right) on Jupiter's moon Ganymede, taken by
Voyager 2