Facula
Large, irregular, bright areas on the surface of the Sun, particularly near the limb. They precede the appearance of sunspots and can remain for some months afterwards.
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Category: Astronomical
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Filament
A strand of (relatively) cool gas suspended over the Sun (or star) by magnetic fields, which appears dark against the disc of the Sun. A filament on the limb of the Sun seen in emission against the dark sky is called a solar prominence.
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Category: Astronomical
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Fortuna
In Roman mythology, goddess of fortune, chance and luck.
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Category: Astronomical
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feldspar
A group of rock-forming minerals that make up about 60% of the Earth's crust.
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Category: Astronomical
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Fault
A fracture or zone of fractures in a planet's crust, accompanied by displacement of the opposing sides.
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Category: Astronomical
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