Fibrilles
Striations or streaks which are observed to form whirls in the Solar chromosphere.
Fictitious Mean Sun ...
Optical fibers of this type can be used to view inaccessible objects and to carry laser signals in telecommunications. [DC99]
(b) A long, thin strand of glass capable of excellent transmission of light over large distances. [McL97]
Fibrilles ...
Features discernible on the surface of the moon include craters, mountain ranges, plains or maria, faults, domes, rilles, and rays. The largest distinct crater, called Bailly, is about 295 km (about 183 mi) wide and 3960 m (about 13,000 ft) deep.
You certainly need magnification for you to see rills (also called rilles or clefts). Rills look like dried up riverbeds and can be either straight or irregular.
RILLE - Long narrow depression on the surface of the Moon; also called "sinuous rilles". Lunar rilles usually flow away from small pit structures and probably mark lava channels or collapsed lava tubes that formed during mare volcanism.
Evidence for past volcanic activity on the Moon is found in the form of solidified lava channels called rilles. Mercury's surface features bear a striking similarity to those of the Moon.
Other prominent surface features include the rilles and rays. Rilles are sinuous, canyonlike clefts found near the edges of mountain ranges. Rays are bright streaks radiating outward from certain craters, such as Tycho.
They include long sinuous forms, termed "canali", and sinuous rilles. Canali are best preserved in regions of subdued relief. They have a high width-to-depth ratio and maintain a remarkably constant width over very long distances.
Located prominently just to the east of the mid-point of this feature is the Bürg crater. The western part of the Lacus Mortis contains an extensive system of criss-crossing rilles collectively designated Rimae Bürg.
Lunokhod 2 operated for about 4 months, covered 37 km of terrain including hilly upland areas and rilles, and sent back 86 panoramic images and over 80,000 TV pictures.
has no large volcanoes and no current volcanic activity, although recent evidence suggests it may still possess a partially molten core. However, the Moon does have many volcanic features such as maria (the darker patches seen on the moon), rilles ...
first moon landing was in the Mare Tranquillitatis (the Sea of Tranquility). Maria are concentrated on the side of the moon that faces the Earth; the far side has very few of these plains. Scientists don't know why this is so.
CRATERS AND RILLES ...
Various chains of mountains are actually the edges of craters that haven't been eroded away or covered up by the formation of the Mare.
Volcanic features. There are only small numbers of volcanic mountains as well as a few lava flow tubes (rilles).
 See also: Moon, Diameter, Rille, Earth, Crater
  
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